Dr. Kreitman received his M.D. from Ohio State University in 1985 and obtained his internal medicine residency training at Duke University from 1985 to 1988. He received his medical oncology fellowship training at the NIH from 1988 to 1991, has been working in the immunotoxin field since 1989, and has been directing clinical trials with immunotoxins since 1996. He also specializes in the treatment of hairy cell leukemia with immunotoxins and other agents.