Cox, 62, was born in Suffolk County. He married Tricia Nixon in the Rose Garden at the White House in 1971 before Nixon was re-elected to his second term. They now live in Manhattan with their son, Christopher.
Cox is a partner in the Manhattan law firm of Patterson, Belknap, Webb and Tyler.
Cox is a member of the Board of Trustees of the State University of New York. His SUNY biography said he serves as chairman of the State Council of Parks, Recreation and Historic Preservation and as a member of the State Commission on Judicial Nomination for Court of Appeals candidates.
He is listed in Who's Who in American Law as a "Republican Episcopalian."
Cox created an exploratory committee in 2005 to unseat Democratic U.S. Sen. Hillary Rodham Clinton, but has not been elected to public office.