Charles R. Thomas, MD

Dr. Thomas is Professor and Chair of OHSU’s Radiation Medicine Department and an active member of the Knight Cancer Institute. He joined the OHSU faculty in November 2005. He received his medical degree from the University of Illinois College of Medicine and is trained in medical oncology and radiation oncology. He has obtained triple-board certification in Radiation Oncology (American Board of Radiology), Medical Oncology and Internal Medicine (American Board of Internal Medicine). He is a member of the National Cancer Institute’s Rectal-Anal Cancer Task Force.

Dr. Thomas is author or co-author of over 240 journal articles and is a co-editor of multiple textbooks including Mediastinal Tumors (Springer-Verlag, 1995), Biliary Tract & Gallbladder Cancers: Diagnosis and Therapy (Demos Medical Publishing, 2008), and Esophagus Cancers: Practice and Principles (Demos Medical Publishing, 2009). Learn More

Jerry Jaboin, MD, PhD

Dr. Jaboin is Associate Professor and the Vice-Chair of the OHSU Radiation Medicine Department. He received his medical and doctorate degrees from Howard University.  His clinical research and expertise is on the treatment of pediatric and adult brain tumors and he has lead the programmatic development of the OHSU’s pediatric and central nervous system radiation oncology programs. When he is not in the clinic or lab, he enjoys viewing Marvel and Star Wars movies with his family and friends.

His research focus includes the identification of novel gene targets and biomarkers, and the development of novel techniques to enhance the standard therapies used to approach brain tumors. His ongoing research has been supported by Robert Wood Johnson. Learn More

Aaron Grossberg, MD, PhD

Dr. Grossberg is an assistant professor of radiation medicine. He completed his medical and doctorate degrees at OHSU before completing his residency training in radiation oncology at MD Anderson Cancer Center. Dr. Grossberg’s practice focuses on cancers of the pancreas and breast. He is interested in the use of stereotactic body radiation therapy (SBRT) for treatment of both early and locally-advanced pancreas cancer with an emphasis on genetic and molecular factors that affect toxicities after radiation therapy.

In a joint appointment with the Cancer Early Detection Advanced Research Center and the Brenden-Colson Center for Pancreatic Care, Dr. Grossberg studies the interaction between cancer and metabolism in an effort to identify ways to diagnose cancers sooner and improve the quality of life of cancer patients. Learn More

Arthur Hung, MD

Dr. Hung is an assistant professor of radiation medicine and serves as Medical Director of the Radiation Therapy Training Program. He received his medical degree at The Ohio State University. Dr. Hung joined the faculty in 2002 after finishing his residency at the University of Texas – MD Anderson Cancer Center. Growing up in Cleveland gave him an appreciation for the Cleveland Browns and the snow.  Outside work, he and his boys are avid skiers and diehard Browns’ fans.

His research is focused on developing and refining the latest technology to deliver radiation with more effectiveness and less toxicity than ever before possible and clinical interests are in cancers of the genitourinary tract, gastrointestinal tract, hepatobiliary system, soft tissue sarcomas, and melanomas. Learn More

John Holland, MD

Dr. Holland is an associate professor of radiation medicine and serves as the Medical Residency Associate Program Director. He received a medical degree from Washington University in St. Louis. He has been part of OSHU’s medical staff since 1994. Dr. Holland serves as principal investigator at OHSU for Radiation Therapy Oncology Group (RTOG) and NRG studies. He was selected as the 'Outstanding Faculty Teacher Award' recipient by OHSU’s residents in 2006 and 2007.

His research and clinical interests include head & neck and thoracic malignancies, focusing on the morbidities of radiation therapy (+/- chemotherapy) with hopes of reducing future side effects. Learn More

Joshua Walker, MD, PHD

Dr. Walker is an assistant professor of radiation medicine. He received his master’s and doctorate degrees from OHSU. After completing his residency in 2018, he joined the radiation medicine faculty. Learn More

Nima Nabavizadeh, MD

Dr. Nabavizadeh is an assistant professor of radiation medicine and serves as the Medical Residency Program Director and Medical Student Clerkship Director. He received his medical degree from University of Oklahoma College of Medicine and was an inductee to the Alpha Omega Alpha honors society for medical academic excellence.  He also holds a degree in Mechanical Engineering from the University of Oklahoma.  After completing his in 2016, he joined the radiation medicine faculty. In his spare time, he enjoys bicycling, skiing and exploring the natural beauty of the Pacific Northwest with his wife, son and daughter (in their camper van).

He specializes in caring for people with lymphoma and gastrointestinal cancers, but also has experience treating a wide variety of cancers with radiation therapy. Learn More

Reid F. Thompson, MD, PhD

Dr. Thompson is an assistant professor of radiation medicine and a member of the Knight Cancer Institute’s Computational Biology Program.  He received his medical and doctorate degrees from the Albert Einstein College of Medicine and trained at the University of Pennsylvania. He also holds degrees in genetics and biophysical chemistry. He joined the Portland Veterans Affairs Medical Center and OHSU faculties in 2016. Along with his husband, he is the proud father of an adorable baby girl.

His research interests include immunotherapy, genomics, clinical data science, precision medicine, and artificial intelligence in medical imaging. Learn More

Sahar Rosenbaum, MD

Dr. Rosenbaum is an assistant professor of radiation medicine and serves as Medical Director of Radiation Oncology at Columbia Memorial Hospital-OHSU Knight Cancer Center in Astoria, Oregon. She received her medical degree from the Medical College of Pennsylvania in Philadelphia and has been recognized as Atlanta’s “Top Docs” for 2014, 2015, & 2017. Dr. Rosenbaum was born in Israel and raised in South Africa.  She enjoys quilting, knitting, and spending as much time as possible with her granddaughter. 

Shushan Rana MD

Dr. Rana is an instructor of radiation medicine. He received his medical degree from University Health Science Center San Antonio. He completed his internship training in internal medicine at Providence Portland Medical Center in and completed his radiation medicine residency training at OHSU in 2018.

He is a clinician scientist with a focus on non-coding RNAs in vascular-mediated tumor immune regulation. Learn More

Timur Mitin, MD, PhD

Dr. Mitin is Associate Professor of Radiation Medicine and serves as Medical Director Tuality/OHSU Cancer Center in Hillsboro, Oregon. Dr. Mitin was born in Moscow, Russia and came to the United States at 16.  He received his medical and doctorate degrees from Tufts University and completed his residency training at the Harvard Radiation Oncology Program. He joined the radiation medicine faculty in 2014 from Massachusetts General Hospital. He is dedicated to bringing the cutting edge cancer treatment modalities to his patients.

His research and clinical interests are in the treatment of genitourinary malignancies, especially bladder preservation therapy for patients with muscle-invasive bladder cancer.  Learn More

James Tanyi, PhD

Dr. Tanyi is Clinical Associate Professor and Interim Chief Physicist of Radiation Medicine. He joined radiation medicine faculty in 2007.  Dr. Tanyi received a doctorate in Medical Physics from the University of Texas Health Science Center at San Antonio, a master’s degree in Nuclear Engineering & Radiological Sciences from University of Michigan, and a bachelor’s degree in physics from the United States Naval Academy. He was born and raised in Cameroon.

His research interests include studying the utility of diffusion-weighted MRI in predicting therapeutic effecacy in head & neck cancers. Learn More

Christopher Aguilera, M.S.

Mr. Aguilera is a medical physicist. His is based at the Mid-Columbia Medical Center, Dalles. He received a bachelor’s degree from Oregon State University and a master's degree in medical physics from Georgia Institute of Technology. Christopher is originally from the Portland area and enjoys spending time with his family, cycling, and raising miniature donkeys. Learn More

Genevieve Wu, PhD

Dr. Wu is an associate professor of medical physics. She holds a doctorate in biomedical physics from UCLA and a master’s degree in medical physics from Purdue University. Learn More

Junan Zhang, PhD

Dr. Zhang is an associate professor of medical physics. He holds a doctorate and master’s degree in electrical engineering from University of California. Learn More

Kyle Gallagher, PhD

Dr. Gallagher is an assistant professor of medical physics. He received his doctorate degree in Medical Physics from Oregon Health & Science University/Oregon State University. A native of Colorado, he enjoys hiking, trail running, skiing, and exploring the outdoors.

His research interests include advanced radiation therapy techniques that reduce the risk of late effects in pediatric patients, radiotherapy in low- and middle-income countries, and dosimetry of therapeutic and stray radiation. Learn More

Malcolm Heard, PhD

Dr. Heard is an assistant professor of medical physics. He received a master’s and doctorate in medical physics from the University of Texas Graduate School of Biomedical Sciences in Houston, Texas. His passions outside of work include traveling, cooking, and exploring the beautiful Pacific Northwest.

Monica Kishore, MS

Ms. Kishore is an assistant professor and serves as Physics Residency Program Director. She received a bachelor’s degree in Physics from Haverford College and a master’s degree in Medical Physics from Duke University. Monica is originally from Boston and in her free time enjoys reading and hiking in the beautiful Portland area. Learn More

Raghavendiran Boopathy, PhD, DABR

Dr. Boopathy is a board certified medical physicist. He received his medical and doctorate degrees from Anna University, India. His area of interest is Image Guidance and Radiobiology. After work, he enjoys cooking with his family and spending time outdoors.

Richard Crilly, PhD

Dr. Crilly is an assistant professor of medical physics and senior medical physicist.  He received his doctorate degree in Medical Physics from Wayne State University. Rick is from the small town Saskatchewan and came to Oregon in 2010 via Detroit and Rapid City. On the rare days he is not working on physics related projects he can be found find him hiking through the wild. Learn More

Stephanie Junell, PhD

Dr. Junell is a clinical assistant professor of medical physics and a board certified medical physicist. She received her medical and doctorate degrees in Medical Physics from the University of Wisconsin. She is originally from Portland and is happy to have the opportunity to serve the community and help provide quality patient care. In her spare time, she runs after her two small children.

Her clinical and research interests include quality improvement, dosimetry and education. Learn More

Susha Pillai, M.Sc, DABR

Ms. Pillai is an assistant professor of medical physics and a board certified medical physicist. She received her master’s degree in Theoretical Physics from India and M.S in Nuclear Engineering from University of Missouri-Columbia. She is originally from Kerala, southwestern tropical state in India. She has her passion for cooking, tropical gardening and teaching Physics & Math to our younger generation. Learn More

• Jeremy Ciporen, MD
• Alison Skalet, MD, PhD
• Brian Fuller, MD
• Carl R. Jenson, MD
• Choong R Kim, MD
• Join Luh, MD (Affiliate Associate Professor)
• Lichung Ku, PhD
• Luciana De Paula, MD
• Mark A. Henderson, MD

• Andrew Trister, MD, PhD
• Archie Bleyer, MD
• Jeremy Ciporen, MD
• Christopher Slatore, MD
• Conroy Sun, PhD
• Clifton David Fuller, MD, PhD, BSc
• David Hamby, PhD
• Deniz Erdogmus, PhD
• Erik Fromme, MD
• Hong-Ming Hu, PhD
• Jacob Raber, PhD
• Jayashree Kalpathy-Cramer, PhD
• Jeffrey Robinson, PhD
• Jose Reyes, PhD
• Joe W. Gray, PhD
• Kathryn Higley, PhD
• Mark Garzotto, MD (publications)
• Martin Colman, MD
• Michael Gough, PhD
• Patrick Gagnon, MD
• Ralf Widenhorn, PhD
• Reid F. Thompson, MD, PhD
• Samuel J. Wang, MD, PhD
• Sherwood "Woody" McClelland, III, MD
• Sophia Bornstein, MD, PhD
• Stuart Helfand, DVM
• Sudarshn "Sud" Anand, PhD
• Tania Vu, PhD
• Todd Palmer, PhD
• William F. Morgan, Ph.D., D.Sc.
• Xubo Song, PhD
• Yiyi Chen, PhD

Joshuah Cobbs, MS

Josh is the Department Administrator of Radiation Medicine. He received his master's degree in healthcare management from OHSU. A passionate advocate for high quality care, Josh focuses his efforts on building effective teams and processes that keep patients and their families at the center. In addition to his role in our department, Josh serves as Adjunct Faculty with OHSU's Division of Management. Outside of work, Josh enjoys time with his family, running along the Portland waterfront, and traveling the world.

Bridgett Sparkman

Bridgett is the Operations Manager of Radiation Medicine. She been with the department since 2011. Before joining OHSU, she was an office manager of multiple art galleries. In her off time, she spends most weekends traveling to watch her children play sports or whipping up one of her delicious baked confection.

Dorothy Ryan, MHSA

Dorothy is the Chief Radiation Therapist and Practice Manager of Radiation Medicine.  She received her master's degree in Health Services Administration from University of St. Francis.  She is originally from Arizona.  She enjoys cooking, traveling and her main passion, Brazilian Jiu Jitsu.

Marita Keppel

Marita is the Financial Administrator and Revenue Cycle Manager of Radiation Medicine. She has been at OHSU since 2007, previously serving as Division Manager in the Division of Arthritis & Rheumatic Diseases and Financial Administrator in the Center for Embryonic Cell & Gene Therapy. In her spare time, she enjoys going to the theater, watching the Oregon Symphony, hiking and hanging out with her pup, Duke Ellington.

Tara J. Foley, MPAS, PA-C

Tara is a board certified physician assistant. She received a graduate degree in Physician Assistant Studies from OHSU and a bachelor's degree in community health education for Ithaca college. She took a break from working in the healthcare industry to attend The French Culinary Institute in New York City and worked as a line cook at a Michelin star restaurant in Brooklyn. Outside of work Tara enjoys cycling, hiking, gardening, spending time with her family and of course, cooking.

Tara currently holds certifications from Advanced Practitioner Society for Hematology and Oncology, American Academy of Physician Assistants, American Society for Radiation Oncology, American Society of Clinical Oncology, Association of Physician Assistants in Oncology, and National Commission on the Certification of Physician Assistants.

Peter Bennett, LCSW

Peter is a licensed clinical social worker (LCSW) and has oncology social work certification (OSW-C). He received a master's degree in Social Work from Portland State University and holds bachelor's degree degrees in history and French from the University of Michigan. He aims to help people in cancer treatment with a range of assistance, from practical support to counseling and referrals to local support resources. Peter enjoys spending time with his family and in exploring the beauty of the natural world. 

Susan Hedlund, MSW, LCSW, OSW-C

Susan is a licensed clinical social worker (LCSW) and certified oncology social work. She received master's degree in social work from Portland State University and a bachelor's degree from University of California. Susan has been an oncology social worker for over 30 years and specializes in the development and provision of psychosocial support services for people with cancer and their loved ones. She currently supervises adult oncology social workers at OHSU and coordinate wellness offerings of yoga, mindfulness-based stress reduction, exercise, massage, and retreats for people with cancer.

Katherine Bagwell, RD, LD

Katherine is a registered and licensed dietitian. She works with patients who have breast, lung, sarcoma, blood cancer, melanomas, brain tumors, and head and neck cancers. Learn More

Angie Rademacher, ND, LAc, RN

Angie is a naturopathic doctor. She holds a doctorate in naturopathic medicine, a master's degree in oriental medicine, and a bachelor's degree of nursing.

George Soriano

George is a medical assistant and paramedic. He is originally from El Paso, Texas. In his free time, he enjoys grilling, playing the guitar, favorite sport watching baseball (go Dodgers!).

Feather Coates

Feather is a patient access specialist (PAS). She received an associate's degree in criminal justice from the University of Phoenix. She is from Washington State, been with the Radiation Medicine for 17 years. Her enjoys spending time with family, watching her son play baseball and traveling.

Megan Albini

Megan is a patient access specialist (PAS). She graduated from Oregon State University with a degree in Human Development and Family Sciences. Megan is originally from California and enjoys spending time with family, photography, and traveling.

Mona Jimenez

Mona is a patient access specialist (PAS). She is also a board certified medical assistant, working in the medical industry for over 23 years. Her hobbies include spending time with family, going to 80's concerts, donating home made things, and love working for what she loves best, patient care.

Tammy Zell

Tammy is a patient access specialist (PAS). She is based at the Beaverton Cancer Clinic. Tammy is originally from South Dakota and has been living in Oregon for the past 19 years. In her free time, she enjoys spending time with her daughter, watching the Blazers and other sports, and going to the movies.

Barbara Agrimson CMD, RT (R)(T)

Barb is a certified medical dosimetrist and serves as clinical coordinator of the OHSU Radiation Therapy Program. She has previous experience as a radiation therapist. In her free time, she enjoys spending time with her husband and two daughters at the Oregon Coast.

Debra Monaco CMD, RT (R)(T)

Debbie is certified medical dosimetrist.  She has been certified since 1992.  She is a native Oregonian who enjoys the outdoors.  She likes to hike, camp, kayak and play with her huskies.

Lori Willette CMD, BSRT (R)(T)

Lori is a certified medical dosimetrist.  She joined OHSU in 2016 and enjoys getting to work closely with other members of the medical team, the technical challenges of treatment planning, and playing a part in caring for patients. In her free time she loves traveling and glamping with her husband and 2 boys.

Steve Rhodes, BS RT(T),CMD

Steve is a certified medical dosimetrist. He first started working at OHSU in 2004 as a radiation therapist before becoming a dosimetrist in 2007.  Prior to his career in radiation medicine, Steve was a secondary school science teacher for 4 years. In his free time, he likes to travel, workout, and walk the dogs.

 Paul Cooper, Phys, CMD

Paul is a certified medical dosimetrist. He has been with OHSU since 2007 and is based at the Beaverton Cancer Clinic. Paul is originally from England. He enjoys vegetable gardening, cooking, hiking, reading, crossword puzzles, and Dad jokes in his spare time.

Alexis Graf, BSN

Alexis is a registered nurse. She has been with OHSU since 2003, working part-time in radiation medicine and previously the transplant department. Her favorite part of being a nurse is the opportunity to build relationships with those that she serves. In her free time, she enjoys running, camping, spending time with her four boys.

Amy Budwill, BSN

Amy is a registered nurse. She studied Anthropology and Global Health at University of Washington, and received her BSN from OHSU. Amy is originally from Seattle, Washington and in her free time she enjoys traveling and hiking.

Angel Franklin, BSN

Angel is a registered nurse. She received a Bachelor’s degree in Nursing from Washington State University and has always had a passion for the Oncology nursing field. Angel has always lived in the Pacific Northwest and enjoys spending time with her family and traveling.

Litti K. Bledsoe, BSN

Litti is a registered nurse. She enjoying spending time with her husband and two daughters and loves exploring the outdoors when the weather is nice.

Maggie Rising, RN, JD, PhD

Maggie is a part-time resource registered nurse. She also holds faculty appointments at PCC and UP. She loves outdoor activities, exercise, yard work, music, theater, reading and learning more about others. She's the proud mom of 2 grown boys (in their twenties) and lives with her 2 spoiled dogs and ancient kitty.

Michelle Wade, RN, BSN, OCN

Michelle is the charge nurse for radiation medicine. She received her bachelor’s degree in biology from Centre College in Kentucky and her BSN from Bellarmine University. She enjoys travelling, hiking, and spending time with friends and family.

Swastika “Tika” Weigel, BSN

Tika is a registered nurse. She and radiation medicine in 2018 and has been a part of OHSU since her first job at 16 years old. Tika was raised here in Portland Oregon and in her free time she loves to volunteer in the community, travel and spend time outdoors with her husband and puppy.

 Jennifer Lockhart, RN

Jennifer is a registered nurse and an oncology certified nurse. She is based at the Beaverton Cancer Clinic. She joined Radiation Medicine in 2007. Jennifer is an active member in ONS Mt Hood Chapter, American Society for Radiation Oncology, and an active participant in unit-based nursing practice committee. During her time off she enjoys taking care of her family, cooking, and outdoor activities.

Andrea Dupuis

Andrea is lead radiation therapist.  She received a degree in Radiation Therapy from OHSU and has been a radiation therapist for 25 years. She was a part of the pioneering treatment team that first started treating with the 2100 linear accelerator. Andrea grew up in the Portland Metro area and spends her free time keeping up with her teenage girls and in her free time and fostering Jack Russell Terriers.

Bonnie Luedloff

Bonnie is lead radiation therapist and serves as a member of the Student Advisory Committee. She has been part of the OHSU team since 2003 and was part of the team to treat the first patient in Kohler Pavilion.  She enjoys hiking the Pacific Northwest with family, friends and her black lab Lucy.

Elsbeth Allanketner

Elsbeth is a radiation therapist. She has lived in Portland, Oregon since 2000. In her free time, she enjoys spending time with her family, gardening, and hiking.

Janet Garrett

Janet is a radiation therapist. She received degrees in radiation therapy and radiologic technology. Janet has been in healthcare for over 25 years and was on the staff at one of the first Portland are facilities to treat with intensity-modulated radiation therapy (IMRT).

Jennifer McLaughlin

Jennifer is a radiation therapist. She received degrees in radiation therapy and radiologic technology. Jennifer moved back to the West coast in 2008 to join the OHSU team after spending a year back East.

Jillian Bacon

Jillian is a radiation therapist. She received her training at OHSU and Oregon State University. Jillian is from Pocatello, Idaho and enjoys sampling new foods and trying new restaurants. She also loves watching the Portland Trailblazers win (go ‘zers!).

Joanne Reasoner

JoAnne is a radiation therapist. She received her bachelor’s degree in Radiation Therapy from OHSU. Joanne was previously a vet tech for eight years. In her free time, she enjoys travelling with her husband and three dogs, as well as dog training and cooking.

Julia Ryan

Julia is a radiation therapist who specializing in simulation. She received her bachelor’s degree in Radiation Therapy from OHSU. Her hobbies include camping, gardening, and spending time with her partner and dogs.

Karlee Betts

Karlee is a radiation therapist. She received her bachelors from Weber State University in Utah. Karlee grew up in Woodinville, Washington and recently moved to the Portland area. She enjoys reading, snowboarding, and spending time with her dog and husband.

Linette Chapman

Linette is a radiation therapist.  She began working in radiation medicine in 2007 and joined the team permanently in 2008.  She loves to globe trot, go to the beach, and hang out with friends/family.

Morgan Oishi

Morgan is a radiation therapist. She received her degree from Oregon State and OHSU. Morgan measures in millimeters at work, but colors outside the lines at play. Interacting and caring for patients is her favorite part of the job.

Ramon Sison

Ramon is a radiation therapist. He received his bachelor’s degree in Radiation Therapy from OHSU in 2003. In his earlier days, he worked as a karaoke dj.

Rebecca Botaitis

Rebecca is a lead radiation therapist.  She has received degrees from Oregon State University and OHSU. Rebecca is a native of the Pacific Northwest and enjoys hiking outdoors in all weather, reading books, making crafts and traveling the world.

Robert Breckenridge

Bob is a radiation therapist. He graduated from the OHSU Radiation Therapy Program in 1994. When not at work, Bob can be found at the beach or on a trail almost every weekend.

Shawn Molden

Shawn is a radiation therapist. He has spent the last 14 years living in Oregon, so he was told he doesn't have to admit to being originally from California anymore. His hobbies include hiking, exploring Oregon's wine country, traveling, and spending time with his partner and their two dogs.

Slavik Gerega

Slavik is a is a radiation therapist. He holds a bachelor of science in radiological technology. He enjoys making music with the cello and piano and has a habit of buying books at a much quicker rate than I can read them.

Barbara Kroon

Barb is a radiation therapist. She is based at the Beaverton Cancer Clinic. Barb received a certificate in radiologic technology and radiation therapy from University of Wisconsin. In her free time, she enjoys spending time with her husband and three kids.

Hilary Dekker

Hilary is a radiation therapist based at the Beaverton Cancer Clinic.

Linea O'Brien

Linea is a radiation therapist. She is based at the Beaverton Cancer Clinic. Linea graduated from OHSU's radiation therapy program in 2009 and became a member of the team shortly after. She enjoys helping and caring for patients, as well as the technical challenges of working with the machines. In her free time, she enjoys playing video games and board games, watching movies, and spending time with her friends, family, and cats.

Amanda Kahoe

Amanda is a radiation therapist at Tuality/OHSU Cancer Center. She received a bachelor’s degrees in Health Science and Community Health & Minor in Business from Portland State University and Radiation Therapy from OHSU.

Anton Hougardy-Sato

Anton is chief radiation therapist and manager at Tuality/OHSU Cancer Center. He received a bachelor’s degree in Radiation Therapy from OHSU.

Estel Hayes, III

Estel is a radiation therapist at Tuality/OHSU Cancer Center.

Dr. Michael James Gagnon

1968-2015

Dr. William F. Morgan

1952-2015

Dr. William T. Moss, Chairman Emeritus

1918-2015