Faculty and Staff

The Department of Radiation Medicine is made up of a diverse group of radiation oncologists, medical physicists, residents, and clinical staff. Get to know more about who'll be assisting during your treatment!

                                                Jump to:  Department leadership   |  Faculty   |   Residents   |   Clinical staff   |   Support staff

Charles R. Thomas, Jr., M.D.

Charles Thomas, MD

Charles R. Thomas, Jr., M.D. is Professor and Chair of the Department of Radiation Medicine 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, M.D., Ph.D.

Jerry Jaboin, MD, PhD

Jerry Jaboin, M.D., Ph.D. is executive vice-chair and associate professor 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. Learn More

James Tanyi, Ph.D.

James Tanyi, Ph.D.

James Tanyi, Ph.D. is Vice Chair of Physics, Technology and Clinical Strategy, Director of Radiation Physics and Clinical Associate Professor of the Department 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.

Joshuah Cobbs, M.S.

Joshuah Cobbs

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, M.H.S.A.

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.

Faculty

Residents

Christie Binder, M.D., Ph.D.

Dr. Binder is a chief resident in the Radiation Medicine Department.  She received her medical and doctorate degrees in genetics at Tufts University.  Dr. Binder is currently investigating biomarkers in urine that would help detect hepatocellular carcinoma at an early stage. She enjoys anything that gets her outside, particularly skiing, hiking, volleyball, and gardening.  She loves snow and chocolate.

Her research interests include uveal melanomas, sarcomas, and hepatocellular carcinoma biomarkers.

Simon Brown, M.D.

Dr. Brown is a chief resident in the Radiation Medicine Department.  He received his medical degree from the Medical University of South Carolina and completed his internship year in surgery at OHSU. Dr. Brown is currently investigating ways to reduce skin toxicity in patients.

His research interests include non-malignant disorders, clinical research, quality management, health disparities.

Blair Murphy, M.D.

Dr. Murphy is a PGY-4 resident in the Radiation Medicine Department. She received her medical degree from University of Cincinnati College of Medicine and completed her internship year in internal medicine at Saint Joseph Hospital. She has studied abroad in Mexico, India, and Nepal and spent a summer doing research in Honduras. She is enjoying her time outside of the hospital doing activities such as camping, skiing, climbing, and kayaking.

She is specifically interested in pursuing a career in pediatric radiation oncology. 

Garth Tormoen, M.D., Ph.D.

Dr. Tormoen is a PGY-4 resident in the Radiation Medicine Department. He received his medical and doctorate degrees from OHSU and holds a bachelor’s in engineering from Michigan Technological University. He completed his internship year at Providence Portland Medical Center. Dr. Tormoen joined the Radiation Oncology residency program in 2016, and started the B. Leonard Holman Research Pathway in 2017. 

His research interests involve understanding the interactions between blood coagulation, anticoagulants and tumor biology with special focus on how these influence the response to radiotherapy.

Aasheesh Kanwar, M.D.

Dr. Kanwar is a PGY-2 resident in the Radiation Medicine Department. He received a medical degree from Texas Tech University Science Center of Medicine and completed his internship year in internal medicine at St. Mary’s Medical Center. 

Christopher Deig , M.D.

Dr. Deig is a PGY-2 resident in the Radiation Medicine Department. He received a medical degree from Indiana University and completed his internship year at the Colorado Health Foundation. He is originally from southern Indiana and played baseball at Wabash College. He enjoys exploring the outdoors with his wife and daughter, skiing, as well as capturing landscape photographs.

Incoming residents

2019

  • Carl Post, MD
  • Hans Kim, MD

2020

  • Jehan Yahya, MD 
  • Kim Ohaegbulam, MD, PhD

Tyler Roberts, M.S.

Mr. Roberts is a first year medical physics resident. He received his bachelor’s degree from the University of Arizona and his master’s degree from OHSU. He spends his free time cooking, running, and listening to too many podcasts.

Incoming residents

2019

  • Austin Bunker, M.S.

Clincal staff

Marquam Hill

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).

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.

Beaverton

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.

Michelle Bednar, R.N., B.S.N., O.C.N.

Michelle is the assistant nurse manager for radiation medicine. She manages the nurses and medical assistants. As assistant nurse manager she strives to continuously improve patient experience and the quality of clinical care. She received her bachelor’s degree in biology from Centre College in Kentucky and her BSN from Bellarmine University. She enjoys traveling, hiking, and spending time with friends and family.

Marquam Hill

Alexis Graf, B.S.N.

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, B.S.N.

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, B.S.N.

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, B.S.N.

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, R.N., J.D., Ph.D.

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.

Swastika “Tika” Weigel, B.S.N.

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.

Beaverton

Jennifer Lockhart, R.N.

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.

Marquam Hill

Barbara Agrimson C.M.D., R.T. (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 C.M.D., R.T. (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 C.M.D., B.S.R.T. (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, B.S. R.T.(T),C.M.D.

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.

Beaverton

Paul Cooper, Phys, C.M.D.

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.

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!).

Lynnell Terry

Peter Bennett, L.C.S.W.

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, M.S.W., L.C.S.W., O.S.W-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, R.D., L.D.

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 about cancer nutrition services.

Angie Rademacher, N.D., L.Ac., R.N.

Angie is a naturopathic doctor specializing in acupuncture with a special interest in oncology. She holds a doctorate in naturopathic medicine, a master's degree in oriental medicine, and a bachelor's degree of nursing. Learn more about Dr. Rademacher's work.

Support staff

Marquam Hill

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 since the early 2000s. Her enjoys spending time with family, watching her son play baseball and traveling.

Mona Jimenez

Mona is a patient access specialist (PAS). She takes pleasure in working for what she loves best, patient care. Mona is also a board certified medical assistant and began working in the medical industry in the late 1990s. Her hobbies include spending time with family, going to 80's concerts, and donating homemade things.

Beaverton

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 since 2000. In her free time, she enjoys spending time with her daughter, watching the Blazers and other sports, and going to the movies.

Amanda Pena

Amanda is the clinical administrative assistant, supporting Dr. Jerry Jaboin, Associate Professor and the Vice-Chair. Amanda is the clinical administrative assistant working under Jerry Jaboin, the vice chair of radiation medicine. She has a degree in Psychology from Portland State University, and her background is in retail & office management. In her spare time, she loves to read, spend time with her 12 year old Husky, and do web design.

Lindsay Tillman

Lindsay is the executive specialist for the Department of Radiation Medicine, supporting the Chair and Department Administration. She has been with the department since 2017. Before joining OHSU, she received a bachelor of science in communication studies from Western Oregon University and served in the United States Navy for 6 years. She enjoys spending time with her husband and 2 dogs and traveling to see her in-laws or with her family here in Oregon.

Rebecca Bowen

Rebecca is the administrative assistant for the physics division, supporting Dr. James Tanyi, Associate Professor and Chief Physicist. She loves the Pacific Northwest and has lived here since the age of four. She has a degree in communication studies and a degree in American history. In her free time, she enjoys practicing Irish dance, eating too much ice cream, providing obscure history facts during trivia, and traveling.

Doug Ellis

Doug is the computer user support analyst for the Department of Radiation Medicine. He is responsible for clinical applications and technical analysis support for the department.

                                                Jump to:  Department leadership   |  Faculty   |   Residents   |   Clinical staff   |   Support staff