RESIDENTS EXECUTIVE COMMITTEE
Felix Ehret is a PGY-4 radiation oncology resident and assistant professor in the Department of Radiation Oncology at the Charité, Berlin, Germany, and a current research fellow at the Massachusetts General Hospital and Harvard Medical School.
Radiosurgery has played a central role in his life as a physician-scientist for many years. Felix is a passionate researcher focusing on stereotactic radiosurgery, stereotactic body radiotherapy, and neuro-oncology.
“The Radiosurgery Society is a vital, interdisciplinary group of physicians, physicists, and other experts in the field, significantly contributing to the advancement of radiosurgery. The RSS Resident's Executive Committee serves as a central platform within the Radiosurgery Society, facilitating the exchange among residents and offering opportunities to participate in the society’s activities. Moreover, it enables residents to shape the society and its future. “
Tugce Kutuk, MD is a PGY-2 Radiation Oncology resident at The Ohio State University – The James Comprehensive Cancer Center. She earned her medical degree from Hacettepe University School of Medicine and completed her initial radiation oncology training at Ankara University in Turkey, graduating among the top in her class.
Driven by a passion for advancing cancer care on a global scale, Tugce has held clinical and research positions at leading institutions including the Miami Cancer Institute, Memorial Sloan Kettering Cancer Center, H. Lee Moffitt Cancer Center, and the International Atomic Energy Agency. Her work on integrating app-based neurocognitive assessments into stereotactic radiosurgery practice earned her the Radiosurgery Society's Members in Training Research Achievement Award. Having served on the RSS Residents Committee Executive Board over the past year, Tugce is eager to continue building on that momentum. As Vice Chair, she hopes to foster broader resident engagement, promote educational initiatives, and strengthen mentorship opportunities for trainees interested in radiosurgery.
Aseem Rai Bhatnagar, MD is a PGY-5 Radiation Oncology resident at Henry Ford Health in Detroit, MI.
He earned his medical degree from Saurashtra University and completed his initial Radiation Oncology training at Tata Memorial Hospital and S.M.S. Medical College in India. Motivated by a commitment to improving cancer care worldwide, he has been a recipient of the ASCO Merit Award, the ACORD Fellowship in Sydney, Australia, the European School of Oncology award, the Susan G. Komen award for breast cancer research, the EORTC training award, the International Mentorship Award by the International Association for the Study of Lung Cancer (IASLC) at Wakayama University, Japan, and has several other accolades to his name.
Jesus E. Juarez Casillas, MD, MS is a PGY-5 radiation oncology resident and research fellow in the Ahmanson Translational Theranostics Division at UCLA.
He earned his medical degree from the UCLA David Geffen School of Medicine in partnership with Charles R. Drew University of Medicine and Science. His research focuses in advancing treatment effectiveness and enhancing patient quality of life through innovations in molecular imaging, stereotactic body radiotherapy (SBRT), and radioligand therapy. Dr. Juarez is honored to join the Executive Board of the Radiosurgery Society (RSS) Resident’s Association.
Nilanjan Halder, MD is a PGY-5 resident who completed medical school at the Sidney Kimmel Medical College at Jefferson University and joined their radiation oncology residency program after graduation.
During training, he developed a strong passion for artificial intelligence and stereotactic body and radiosurgery (SBRT/SRT), particularly in predicting treatment responses and toxicity outcomes He had the privilege of mentoring students and educating others about radiation oncology. And was the founder of The Jefferson Association for Radiation Oncology, a student interest group created alongside several motivated students.
“Throughout my career, I hope to continue engaging trainees, collaborating with colleagues across specialties, and connecting with patients to foster a deeper understanding of radiation therapy as its role in medicine evolves. I’m especially excited about the expanding applications of radiosurgery in functional disorders and benign conditions such as ventricular tachycardia.”
Yoonsun Jee, MD is a PGY-3 radiation oncology resident at Henry Ford Hospital in Detroit, Michigan.
She completed her bachelor’s degree in chemistry with concentration in Biochemistry at Wake Forest University and obtained her medical degree at Wake Forest University School of Medicine in Winston-Salem, North Carolina. She subsequently completed her intern year at University of Tennessee Graduate School of Medicine in Knoxville, Tennessee. Yoonsun recently gave an oral presentation at the annual 2025 RSS Scientific Meeting on utilizing adaptive MR-guided and CT-guided SBRT for locally recurrent prostate cancer and presented a complex case on using MR-guided adaptive SBRT for recurrent intrahepatic cholangiocarcinoma in segment II of the liver.
Jayavignesh Sekar, MD is a PGY-3 Radiation Oncology resident at Northwell Health / NorthShore University Hospital- Zuckerberg Cancer Center in New York.
He earned his medical degree from The Tamil Nadu Dr. M.G.R. Medical University and completed his initial radiation oncology training at Madras Medical College in Chennai, India. Grounded in a decade of diverse clinical experience and a deep commitment to precision medicine, Jay has contributed to clinical care and research across diverse settings, from rural hospitals in India to academic centers in New York. His involvement in the Radiosurgery Society through participation in expert-led debates and presentations at oncological forums in India reflects his dedication to collaborative learning and advancing Radiation Oncology practices.