Warren was recognized in Chambers USA in the field of Banking & Finance. He has also been named a "leading" lawyer for Banking in the U.S. by IFLR1000.
Warren was a member of the New York State Bar Association, the American Bar Association and the ABA Forum on Air and Space Law-Aircraft Finance and Contracts Division, and was a member of the Corporate Department’s Opinion Review Committee. Warren joined the firm in 1991. Prior to that, he was a partner in the banking department of Milbank, Tweed, Hadley & McCloy.
Warren graduated from Columbia Law School in 1976 and Johns Hopkins University in 1973.