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.