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Prof. Yona Keisari
Chief Scientific Officer

Prof. Keisari is one of two co-inventors of the Alpha DaRT technology. He was a Full Professor of the Dept. of Clinical Microbiology and Immunology, Faculty of Medicine, Tel Aviv University, Israel until 2015, and is now Prof. Emeritus. His studies focus on the activation of anti-tumoral immune reactivity through in-situ destruction of solid tumors with DaRT, and developing means to improved eradication of metastases. He has co-authored 89 peer-reviewed scientific papers, and is an editorial board member of 5 journals. Prof. Keisari was a founder and past president of the Israeli Society for Cancer Research.

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Dr. Robert Den, M.D.
Chief Medical Officer

Dr. Den specializes in radiation oncology and conducts innovative research across a broad variety of malignancies. He serves as an associate professor and a clinical practitioner at Jefferson University. As a leading expert and accomplished clinician in the field, Dr. Den is responsible for furthering the company’s clinical and research operations. Dr. Den received his medical degree from Harvard Medical School in 2006. Today, his focus is on improving the lives of patients suffering from cancer though the incorporation of novel agents with radiation therapy.


Prof. Aron Popovtzer
Medical Consultant

Prof. Aron Popovtzer is a Professor of Radiation Oncology and Head of the Sharett Institute of Oncology at Hadassah Medical Center, Jerusalem. Prof. Popovtzer has authored and co-authored several national and international publications and has received several awards for his contributions to the scientific community.


Prof. Itzhak Kelson
Chief Physics Officer

Prof. Kelson initially co-invented the Alpha DaRT technology in 2003. Today, Prof. Kelson is an Emeritus Professor and retired Chairman of the Tel Aviv University Physics Department. He has held research and teaching positions at the Weizmann Institute, Yale University, Lawrence Livermore National Laboratory, University of Wisconsin, Brookhaven National Laboratory, and other institutions.


Prof. Michael J. Zelefsky, M.D.
Chief Medical Consultant

Dr. Zelefsky is Professor of Radiation Oncology and co-leader of the Genitourinary Disease Management Team at Memorial Sloan Kettering Cancer Center in New York. He is former President and Chairman of the Board at the American Brachytherapy Society and currently Editor in Chief of Brachytherapy. Dr. Zelefsky has published over 400 articles in the oncology literature and is highly experienced in the areas of high-dose-rate and LDR local radiotherapy. Dr. Zelefsky has received numerous awards for his research and work in the field. Dr. Zelefsky lectures nationally and internationally about radiation treatments for prostate cancer.

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