The celebrity couple pitches the margarine brands new variety. St. Elsewhere, William Daniels & Bonnie Bartlett (Dr. Mark Craig and Ellen Craig) at Independence Hall, Philadelphia, for 1986 season opener (Ep # 6301). Mr. Daniels gets a little help from his wife, Bonnie. Everyone needs a Bonnie. I talked to WILLIAM DANIELS, Author and Actor on Broadway, TV and Film. Watch my entire interview with this fascinating man. WILLIAM DANIELS was Mr . Daniels, a character actor best known for his roles on the TV series St. Elsewhere, Knight Rider, and Boy Meets World, looks back on his career in excruciating .