American businessman and philanthropist James Herbert Dahl (born August 16, 1953) is the founder and former chairman of Rock Creek Capital, a Jacksonville, Florida-based firm that provides investment services centered on acquiring and managing land in an environmentally responsible manner. He served two four-year terms as a member of the Investment Advisory Council for the State of Florida's Pension Fund - the nation's fourth-largest pension fund—beginning in 2001. He was chairman of the council from 2005-06. He previously managed the Convertible Bond Department of investment bank Drexel Burnham Lambert, where he provided testimony against Michael Milken. Dahl was never charged with any wrongdoing.