Meet Our Chief Residents

Brian Tsui

Brian Tsui, MD

Brian was born and raised in Fremont, California. After 18 years in northern California, he decided to move to southern California to study bioengineering at UCSD, where he graduated summa cum laude. Brian then moved to Cleveland to attend medical school at Case Western Reserve University, where he was inducted into the Alpha Omega Alpha honor society. He decided that he wanted to come back to California after four snowy years and completed intern year at UC Irvine before starting residency in diagnostic radiology at UCLA. After finishing residency, he will move back to northern California for neuroradiology fellowship at UCSF. Brian is thrilled to work with Reed, Shimwoo, and Sipan as co-chiefs. He is looking forward to supporting radiology residents in the program as they advance through their graduate medical education.


Steven (Reed) Plimpton

Steven Reed Plimpton, MD, MS

Steven “Reed” Plimpton was born and raised in Phoenix, Arizona, the eldest and least successful of four children. Mistakenly thinking the West had nothing left to offer, he matriculated at the University of Pennsylvania where he studied physics. He also earned his master’s in Philly before moving to the University of Colorado to work in radiation oncology. Having decided on yet more schooling, he moved to California and attended the University of California, Irvine for medical school. He then made the best decision of his life to complete his preliminary year in Portland, Oregon where he met his fiancé, Elle. To continue his trend of sampling Southern California universities and keep his stalwart dog, Samwise, close to his favorite dog beach, he will be a fellow at USC in breast/body. Reed is humbled by having been chosen as a chief resident and will do his best to keep up with his extraordinary co-chiefs.


Sipan Mathevosian*

Sipan Mathevosian, MD, MS

Sipan is a Southern California native raised in Glendale, California. He attended University of California, Santa Barbara for his undergraduate education where he majored in biopsychology, after which he spent a few years working different jobs prior to pursuing medicine. He obtained a master’s in biomedical sciences then completed his medical training at Chicago Medical School where he was active in curriculum development and interventional radiology research and education. He graduated medical school with distinction and was inducted into the Alpha Omega Alpha honor medical society. He completed an internship in surgery at Kaiser Permanente LAMC, followed by residency training in diagnostic radiology at UCLA, and is currently training to become a world class vascular interventional radiologist at UCLA. Sipan is deeply honored to accept the role of chief resident and looks forward to working alongside his co-chiefs to promote a wonderful training environment.


Shimwoo Lee*

Shimwoo Lee, MD

Shimwoo was born in Seoul, Korea, and moved to Modesto, California in her early teens with her parents and younger sister. She attended Harvard University for undergraduate with a major in Chemical and Physical Biology with an East Asian studies minor. She received her medical degree from New York University School of Medicine. After completing her internal medicine internship in USCF Fresno, Shimwoo joined UCLA as an integrated interventional radiology resident. This year, she is honored to serve as one of four radiology chief residents at UCLA. She feels fortunate to have had access to a wealth of excellent clinical and academic opportunities at UCLA and hopes to pay it forward by helping her fellow residents find ways to meet their own educational goals during their training. Her hobbies include digital illustration, cooking Korean food (including making kimchi from scratch), and resistance training.


Chiefs 21-22

Chiefs 2021-2022

Previous Chiefs:
2020-20212019-20202018-20192017-2018