Until 2007, Joshua Koltun was a partner at the global law firm DLA Piper US LLP (and its predecessor firms, including the San Francisco firm Steinhart & Falconer). In April 2007 he opened his own law practice.

Admitted to California state and federal courts, the United States Supreme Court, the United States Courts of Appeal for the Second, Sixth and Ninth Circuits

Law Clerk to the Honorable Robert E. Keeton, U.S. District Court (Massachusetts), 1993 to 1994

Yale Law School, J.D. 1993 (Senior Editor, The Yale Law Journal)

Legislative Analyst to the Massachusetts House of Representatives, 1989 to 1991

Legislative Assistant to U.S. Representative Barney Frank (D-Mass.), 1983 to 1986

Harvard University, B.A.1983 (magna cum laude, Phi Beta Kappa)