Committee
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The Radiosurgery Society®
Physics Committee

Jun Yang, Ph.D., DABR

Jun Yang Ph.D is chief physicist at the Philadelphia CyberKnife. He is a member of the AAPM Task Group #135 and serves on the physics committee for the Radiosurgery Society. As an adjunct clinical associate professor of Drexel University, he has authored and co-authored many publications on medical physics with emphasis on Robotic Radiosurgery technology. Jun joined the Physics Committee in 2011 and as of January 2013, serves as the chairman.


Stanley H. Benedict, M.S., Ph.D.

Dr. Stanley Benedict received an M.S. in Radiological Health Physics from San Diego State University, a Ph.D. in Biomedical Physics from UCLA, and diplomat in Radiological Therapeutic Physics from the American Board of Radiology. He has served as Chief of Clinical Physics at Virginia Commonwealth University and Director of Clinical Physics at the University of Virginia, and is currently Professor and Vice Chair of Clinical Physics in the Department of Radiation Oncology at the University of California at Davis, in Sacramento, California.

His scholastic achievements include over 50 scientific peer-reviewed publications, a dozen book chapters and proceedings, and over 100 peer reviewed scientific abstracts for presentations at international symposia. Dr. Benedict has been PI, co-PI, co-investigator, and collaborator on a wide array of public and privately funded clinical medical physics research, including projects involving image guided radiation therapy, stereotactic radiosurgery, and radiation biology.

Dr. Benedict was the Chair of the AAPM Task Group 101 on Stereotactic Body Radiation Therapy, and is one of the editors of the recently released CRC Press book, Stereotactic Radiosurgery and Stereotactic Body Radiation Therapy (2014). Stan joined the Physics committee in August 2014.


Indrin J. Chetty, Ph.D.

Dr. Chetty received both a Masters of Science and a Ph.D. in Medical Physics from the University of California at Los Angeles. After earning his M.S. degree Dr. Chetty began working part-time as a Clinical Medical Physicist in Radiation Therapy at Providence St. Joseph’s Medical Center in Burbank California. Upon completing his Ph.D., in December 1999, he joined the University of Michigan, Department of Radiation Oncology, where he spent 6 years on the faculty as Assistant Professor. In May, 2006, he accepted the position of Associate Professor and Associate Director of Radiation Physics in the Department of Radiation Oncology at the University of Nebraska Medical Center in Omaha, NE. In November 2007, he joined the Henry Ford Health System as Director of the Radiation Physics Division in the Department of Radiation Oncology. Dr. Chetty has been a part of several IRB-approved clinical studies both at the University of Michigan and the University of Nebraska Medical Center. Dr. Chetty is an NIH/NCI-funded researcher and has also received research grants from the University of Michigan Cancer Center. Dr. Chetty joined the RSS Physics Committee in February 2017.

Christoph Fürweger, Ph.D.

Christoph joined the European CyberKnife Center in Munich, Germany in 2007 and is their chief medical physicist. In 2007, he received his Ph.D from the Atomic Institute of the Austrian Universities and the Medical University with his thesis, Thermoluminescence Dosemeters as Biologically Relevant Detectors. He was a guest researcher at the Heavy Ion Medical Accelerator facility (HIMAC), National Institute of Radiological Sciences (NIRS), Chiba, Japan and a research assistant at the Clinic for Radiotherapy and Radiobiology, Medical University of Vienna. His research areas of interest were in dosimetry and radiobiology in particle fields, cellular signaling, bystander effects. Along with be a member of the Radiosurgery Society (RSS), Christoph is member of the German Society for Medical Physics (DGMP), Austrian Organisation for Radiation Protection (OeVS), and the Alumni Organisation of Vienna Technical University.


Steve Goetsch, Ph.D.

Steve Goetsch is a clinical medical physicist in San Diego County, California. He received his Ph.D. in Medical Physics from the University of Wisconsin Madison in 1983 and directed the Accredited Dosimetry Calibration Laboratory there for 7 years. After 4 years at UCLA Medical Center he became Chief of Physics at the San Diego Gamma Knife Center and also works at Palomar Medical Center and the University of California San Diego Cancer Center in Chula Vista. Steve is Chairman of AAPM Task Group 178 on Gamma Stereotactic Radiosurgery Dosimetry and Quality Assurance. He is a member of AAPM, ASTRO, ISRS and the Health Physics Society. Steve joined the RSS Physics Committee in March 2012.


Grace Gwe-Ya Kim, Ph.D., DABR

Dr. Kim received her doctoral degree in 2001 at Yonsei University in her native Korea. After her graduation, she worked as scientific officer for 7 years in the Medical Device Safety Bureau at the Ministry of Food and Drug Safety in Korea. Dr. Kim completed her post-doc fellowship in the Department of Radiation Oncology at Stanford. She was recruited to join the Department of Radiation Oncology at the UC San Diego in 2009.

She currently serves as a reviewer on American College of Radiation Oncology (ACRO). For the American Association of Physicists in Medicine (AAPM), she is a member of the Calibration Laboratory Accreditation Executive Committee and subcommittee, Task Group 262, Task Group 275, Task Group 292, working group on RO-ILS and a vice-chair of Working Group on Prevention of Errors in Radiation Oncology.

Dr. Kim serves as Associate division director for QA and technical chief for Central Nervous System (CNS) and her primary research interests include intracranial radiosurgery and implementing novel treatment techniques. Dr. Kim joined the RSS Physics Committee in February 2017.



Matthew Podgorsak, PhD

Matthew earned his Ph.D. in Medical Physics from the University of Wisconsin, Madison in 1993. He currently serves as Chief Physicist in the Department of Radiation Medicine at Roswell Park Comprehensive Cancer Center in Buffalo, NY, a position he has held since 1998. He also holds an Associate Professor appointment in the Jacobs School of Medicine and Biomedical Sciences at the University at Buffalo (UB), and he has mentored numerous Master’s and Doctoral students enrolled in UB’s CAMPEP-accredited medical physics graduate program.

Dr. Podgorsak has been supporting a Gamma Knife radiosurgery program since 1998, with his most recent experience being with the ICON. He is board-certified in Radiation Oncology Physics by the American Board of Radiology and the American Board of Medical Physics. He is a Fellow of the American Association of Physicists in Medicine (AAPM) and is a member of the American Society for Radiation Oncology, the American College of Radiation Oncology, and the Radiosurgery Society (RSS). He also serves as the therapy medical physics Trustee for the American Board of Radiology, and he is a member of several AAPM committees.

Dr. Podgorsak is an associate editor for the Journal of Applied Clinical Medical Physics and as a reviewer for several other journals, including the International Journal of Radiation Oncology, Biology, and Physics; Physics in Medicine and Biology; Radiology and Oncology; and Medical Physics. Dr. Podgorsak joined the RSS Physics Committee in July 2020.


Brian Wang, Ph.D.

Brian received his PhD in nuclear engineering from Rensselaer Polytechnic Institute in 2005 and privatim BA from Yale University in 2019. He worked as a faculty medical physicist in the Department of Radiation Oncology at Cooper University Hospital from 2005 to 2007, where he received his clinical training. He joined the University of Utah as an assistant professor in 2007, where he specialized in LINAC-based stereotactic body radiotherapy (SBRT) and stereotactic radiosurgery (SRS). Brian moved to University of Louisville in 2013 to lead the physic team. In 2019, Brian became the Director of Radiation Oncology Physics at Yale New Haven Hospital, leading all the physics, dosimetry, and engineering teams. He is a Fellow of AAPM and an oral board examiner for ABR. Brian is on the presidential chain of NACMPA and a board member of SANTRO. Brian joined the RSS Physics Committee in 2012.


Fang Fang Yin, Ph.D.

Dr. Yin received his PhD in medical physics from the University of Chicago, Illinois in 1992. Currently, He is the Professor and the Director of Radiation Physics in Radiation Oncology Department at Duke University. His primary research interests are imaging and artificial intelligence as well as their applications in the process of radiation therapy. He has published over 320 refereed papers and numerous book chapters and has been a Fellow of both the American Association of Physicists in Medicine and American Association of Radiation Oncology.


The Radiosurgery Society®
Physics Advisory Committee


C-M Charlie Ma, Ph.D.

Dr. C-M Charlie Ma received his Ph.D. in medical physics from the University of London, London, UK in 1992. Dr. Ma continued his radiation therapy research and postdoctoral training at the Institute of Cancer Research and Royal Marsden Hospital, London, UK. He was a research officer at the National Research Council of Canada, Ottawa from 1993 to 1996, and an associate professor at Stanford University, Stanford, CA from 1996-2001. Currently, he is Professor, Director of Radiation Physics and Vice Chairman of the Department of Radiation Oncology at Fox Chase Cancer Center, Philadelphia, PA. Dr. Ma is specialized in Monte Carlo dose calculation, radiation dosimetry, image guidance, treatment optimization and delivery for intensity-modulated photon therapy, and energy- and intensity-modulated electron and proton beams for radiation therapy. He has edited 4 books and published more than 20 book chapters and 150 peer-reviewed journal articles in these areas.

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