Mason was born in Beverly Hills, California, the son of English parents, actor James Mason and actress and commentator Pamela Mason. As a child, Mason appeared in the films The Sandpiper, with Elizabeth Taylor and Richard Burton, and Hero"s Island, along with his father.
Moving to the United States, he worked for Ronald Reagan"s 1979 presidential campaign. Reagan selected him as a delegate-at-large from California to the Republican national convention in 1980. After the election, Mason was named special assistant to the co-chairmen of the presidential inaugural committee.
After the inauguration, Mason was appointed deputy chief of protocol at the State Department.
He was then named as special assistant to the president for political affairs at the White House. On November 5, 1982, Mason resigned his White House position and became the vice president of Rogers and Cowan Public Relations.
In 1986, Reagan appointed him to The Commission for the Preservation of America"s Heritage Abroad, and made him a special advisor to the President"s Council on Physical Fitness and Sports. In 1990, Mason became vice president and head of the independent film division of the William Morris Agency in Beverly Hills.
He left to become chief executive of London Films in 1996.
Mason founded the European television channel Innergy in 1999.
He served as assistant finance director, then as major events director, and served as a member of the campaign"s executive advisory committee. During his tenure he was chosen to attend the funeral services of Egyptian president Anwar Sadat as a member of the official United States delegation along with former United States presidents Richard Nixon, Gerald Ford and Jimmy Carter. In 1984, he became a board member of Musifilm Limited., a partnership with Master of Computer Applications/Universal.
