George Briggs was a member of the Mission: Impossible team from the very beginning. He was one of the first members recruited by Jim Phelps, and he remained with the team for several years. However, in the early days of the show, there were some creative differences between George and the show's producers. George felt that the show should be more realistic, while the producers wanted it to be more action-packed and exciting. These disagreements led to George leaving Mission: Impossible in 1969.