 He had been general counsel of the Department of the Army during the administration of the 41st president, George H.W.Bush, a partner with the law firm of Jenner & Block, an associate general counsel of General Dynamics Corporation, and, beginning in 2008, chief corporate counsel of Chevron Corporation.Haynes is currently general counsel and executive vice president of SIGA Technologies, Inc.

Haynes was born in Waco, Texas, to William James Haynes and his wife.