Gerald Lee McRaney (born August 19, 1947 Collins, Mississippi, USA) is an American television and movie actor. McRaney is best known as one of the stars of the television shows Simon & Simon, Major Dad, and Promised Land. He was a series regular in the first season of Jericho and the final season of Deadwood. He appeared in a recurring role as main antagonist Mason Wood in season eight of Castle. Recently, he played Barlow Connally in the A&E series Longmire and has a recurring role in the NBC series This Is Us as Dr. Nathan Katowski, a role which earned him the Primetime Emmy Award for Outstanding Guest Actor in a Drama Series.