Henry Kaplan was an American radiation oncologist known for his pioneering work in the treatment of cancer. He played a significant role in developing techniques for radiation therapy, particularly in the treatment of Hodgkin's lymphoma and other malignancies. His research contributed to improving patient outcomes and established standards in the field of oncology. Kaplan was also a prominent figure in the establishment of the Stanford University Medical Center, where he served as a professor and helped train many future oncologists. His contributions to cancer treatment and research have had a lasting impact on the medical community and continue to influence cancer care today.