Mark Kleiman is the founder of Factorial Partners, a New York investment fund. Previously, Mark was a portfolio manager and partner at Neuberger Berman (1991–2001) and a vice president at Salomon Brothers Inc. (1986–1991).

Mark received a BA from Princeton University (1982) and an MBA from Stanford University (1986). He was a member of the United States math team for three years and a Putnam fellow.

Mark is a Board member of the Open Door Medical Center.