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Shalom Kalnicki, MD, FASTRO, FACRO

Shalom Kalnicki is Professor and Chairman of the Department of Radiation Oncology at Montefiore Medical Center and Albert Einstein College of Medicine. A physician leader, researcher and teacher, Dr. Kalnicki leads an internationally recognized radiation oncology department since July 2004, when he rejoined the ranks of Montefiore-Einstein.

Throughout his career, Dr. Kalnicki has focused on researching and implementing new technologies in the radiation treatment of cancer. He pioneered the use of intensity modulated radiation therapy (IMRT), image-guided radiation therapy (IGRT), target motion management with 4-D radiation planning, stereotactic body radiation therapy (SBRT) and functional tumor imaging with PET-CT fusion techniques. His research has implications for radiation treatment planning and techniques used for most clinical situations in radiation oncology, including brain, head and neck, thoracic, upper abdominal and pelvic malignancies. His research interests also include quality-of-life issues such as socio-economic disparities in radiation oncology and the impact of family caregiver support on patients’ compliance. In April 2019, Dr. Kalnicki became Chairman of the Board of Directors.


Dr. Gibbs is a Professor of Radiation Oncology and Associate Dean of MD Admissions at Stanford Medicine. Dr. Gibbs’ clinical and research expertise are pediatric and adult brain tumors, and robotic radiosurgery. As former Co-Director of Stanford CyberKnife Radiosurgery program, Dr. Gibbs contributed to building world- renowned clinical programs in innovative radiation treatment of central nervous system tumors and robotic radiosurgery. Dr. Gibbs has served as committee chair for the Radiosurgery Society (formerly CyberKnife Society) and is a dedicated member of the International Stereotactic Radiosurgery Society (ISRS).

In 2014, Dr. Gibbs was appointed as Associate Dean for Medical School Admissions of Stanford Medicine. She is a 2015 Hedwig van Ameringen Executive Leadership in Academic Medicine (ELAM) Fellow and a fellow of the American Society of Radiation Oncology, American College of Radiology, and Association for women Radiologists. In addition to leadership service roles for Radiological Society of North America (RSNA), American Society of Radiation Oncology (ASTRO), and the American Board of Radiology (ABR), Dr. Gibbs is the immediate past chair of the Section on Radiology for the National Medical Association. Dr. Gibbs became President of the Board of Directors in April 2019.


John Kresl completed advanced medical educational and research training in the field of oncology as a National Institute of Health (N.I.H.) supported combined MD/PhD Fellow in Graduate Medical Science training in Molecular and Immunological Tumor Cell Biology, culminating in a Doctor of Philosophy Degree from Northwestern University Graduate School, Evanston, Illinois. In addition to basic science training, Dr. Kresl completed his clinical medical training, receiving a Medical Doctorate Degree from Northwestern University Medical School in Chicago, Illinois. In addition to remaining active in Oncology research, Dr. Kresl is very involved in clinical practice in radiation oncology for all tumor sites. Dr. Kresl has been the principal investigator and co-investigator on dozens of clinical protocols and has published over 150 abstracts, manuscripts and book chapters related to radiation oncology, including editing the first two textbooks on Robotic Radiosurgery. He frequently is an invited lecturer on these topics around the world. Dr. Kresl is Board Certified by the American Board of Radiology in Radiation Oncology. He joined the Board of Directors of the Radiosurgery Society in 2007 and currently serves as Treasurer.

Najeeb Mohideen, MD, FRCR, FASTRO, FACR

Dr. Mohideen, a member of the Radiosurgery Society since 2006, is a Radiation Oncologist at Northwest Community Hospital in Arlington Heights, Illinois. He has held many leadership positions in Radiation Oncology. He has served on the Board of Directors of the American Society for Radiation Oncology (ASTRO) and has also chaired its Health Policy Council. He currently serves on ASTRO’s Health Policy Committee and Payment Reform Workgroup and is Chair of the Radiation Oncology Economics Committee for the American College of Radiology. Dr. Mohideen joined the Board of Directors in March 2015. In April 2016, Dr. Mohideen became Secretary of the Board of Directors.

Stanley H. Benedict, MS, PhD

Dr. Stanley Benedict received his PhD in biomedical physics from UCLA and holds a certification in radiological therapeutic physics from the American Board of Radiology. Dr. Benedict is currently the Professor and Vice Chair of Clinical Physics at University of California at Davis Cancer Center, Department of Radiation Oncology in Sacramento, CA, where he is responsible for supervising physics, dosimetry, and clinical engineering activities of the faculty and staff. Dr. Benedict is a principal investigator and co-investigator on several public and industry funded clinical medical physics research projects, and author of papers focused on image-guided radiation therapy, stereotactic radiosurgery and radiation biology. Dr. Benedict was the chair of the AAPM Recommendations on SBRT (TG101), and he remains very active in stereotactic radiosurgery by participating in clinical trial development and by organizing courses and symposia on SRS/SRT/SBRT. Stan joined the RSS Board of Directors in April 2017.


Dr. Lo is Professor of Radiation Oncology and Neurological Surgery and Vice Chair for Radiation Oncology Strategic Planning, Director of SBRT, University of Washington, Seattle, WA.

Dr. Lo has edited 4 comprehensive textbooks in SRS/ SBRT and has published 193 full peer-reviewed papers, with a majority of them on SRS/ SBRT for all body sites. He has led the SBRT programs in 3 NCI-designated Comprehensive Cancer Centers. He currently serves on the 2019 RSS Annual Scientific Meeting Planning Committee and the Accreditation Committee as Medical Director and has helped develop webinars for the Radiosurgery Society. He became a board member in April 2019.

Michael Schulder, MD, FAANS

Dr. Schulder is vice chair, residency program director, and professor of neurosurgery at the Zucker School of Medicine at Hofstra/Northwell. He also serves as the Director of the Brain Tumor Center, and the Co-Director of the Center for Stereotactic Radiosurgery at Northwell Health. Mike has been a member of the Radiosurgery Society since 2003 (Member #20). He trained in SRS at the University of Florida and at the Brigham and Women's Hospital and has practiced it for over 20 years. Dr. Schulder's experience includes treating patients with the X-Knife, CyberKnife, Novalis, Varian, and Gamma Knife systems. He believes strongly that SRS programs and indeed the entire field are best advanced by surgical specialists working together with radiation oncologists. Dr. Schulder joined the Board of Directors in March 2015.

Helen Shih, MD, MS, MPH, FASTRO

Dr. Shih is Associate Professor of Radiation Oncology at Harvard Medical School, Boston, MA. Helen is a practicing radiation oncologist at Massachusetts General Hospital (MGH). Prior to MGH, Dr. Shih did her undergraduate education at Brown University as a biology major and medical school education at the University of Pennsylvania where she also earned a Master's Degree in Cell & Molecular Biology. She completed a transitional year internship at Beaumont Hospital, Royal Oak, MI, before radiation oncology residency at MGH. She also has a Master's in Public Health from the Harvard School of Public Health. Dr. Shih has remained on staff at MGH and is the Director of the Central Nervous System & Eye Services. She specializes in the treatment of patients with brain and eye tumors. She cares for a range of patients with benign to malignant diagnoses and both primary and metastatic diseases. She is an Associate Professor of Radiation Oncology at Harvard Medical School and Medical Director of the MGH Proton Therapy Program. Dr. Shih joined the RSS Board of Directors in April 2020.

Shankar Siva, PhD, MBBS, FRANZCR

Dr. Siva is an Associate Professor Radiation Oncology, Peter Maccallum Cancer Centre, Victoria, Australia. Shankar is a Radiation Oncologist and NHMRC fellow at the Peter Mac and leads the Stereotactic Ablative Body Radiotherapy (SABR) program and Australia's first dedicated SABR clinic. He completed his PhD with the Molecular Radiation Biology (Martin) Laboratory focusing on translational investigations in precision high-dose lung radiotherapy. He published the first original research from Australia on the use of the SABR technique.

Shankar leads multiple clinical trials in the treatment of lung and urological cancers at the Peter Mac, and is chair of three TransTasman Radiation Oncology Group (TROG) studies in the fields of oligometastases, lung and kidney cancers. He is Co-Chair of the TROG Genitourinary Group, is an executive member of Radiation Oncology Research Committee (RORC) of the Royal Australian and New Zealand College of Radiologists (RANZCR) and Management Advisory Committee (MAC) of the Australasian Lung Cancer Trials Group (ALTG) amongst other leadership roles. He has research interests in high-tech radiotherapy delivery, radiation biology and radiation immunology. Dr. Siva joined the RSS Board of Directors in April 2020.

Ben J. Slotman, MD, PhD, FASTRO, H.FACR

Since 1998, Ben Slotman, MD, PhD has served as Professor and Chairman of the Department of Radiation Oncology at Amsterdam UMC in Amsterdam, The Netherlands. Dr. Slotman received his MD in 1985 and PhD in 1990, both with highest honors at VU University in Amsterdam, The Netherlands and he was registered as radiation oncologist in 1994. Professor Slotman is the (co)-author of more than 350 peer-reviewed publications (H-index=55). He has (co-)organized various conferences and has coordinated a number of trials, including the EORTC study on prophylactic cranial irradiation in extensive stage small cell lung cancer and the international randomized trial on the role of thoracic irradiation in these patients. His research activities are further concentrated on intra- and extracranial stereotactic radiotherapy and the introduction of various new technologies in radiotherapy. He is associate editor of the Journal of Radiosurgery and SBRT.

He was awarded Honorary Fellow of ACR and received the ISRS Jack I. Fabrikant award in 2017. He is president of the American Radium Society and president-elect of ESTRO. Professor Slotman joined the RSS Board of Directors in February 2016.

Jun Yang, PhD

Jun is chief physicist at the Philadelphia CyberKnife. He is a member of the AAPM Task Group #135 and #277 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 Radiosurgery physics, radiobiology and clinical outcomes. Jun joined the Physics Committee in 2011, the RSS Board of Directors in 2012 and has served as the chairman of the Physics Committee since 2013.

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