Leigh William Steinberg is a sports agent. Clients include Ben Roethlisberger, Lennox Lewis, Troy Aikman, Eric Karros, Oscar de la Hoya, and John Starks.
Steinberg was admitted to the California State Bar in 1974 after earning his J.D. from Boalt Hall, UC Berkeley’s law school, in 1973. Steinberg is often credited as the real life inspiration of the sports agent from the film Jerry Maguire. He was a consultant on that film, as well as the TV series Arliss.
Source - Wikipedia http://en.wikipedia.org/wiki/Leigh_Steinberg