Career
Monroe has also worked for Universal Postal Union, DePatie-Freleng, and Metro-Goldwyn-Mayer Animation/Visual Arts. Monroe was one of Jones" master animators, along with Ken Harris, Ben Washam and Abe Levitow. In 1951, Monroe left for Universal Postal Union, working under the supervision of John Hubley and Pete Burness.
He eventually left Universal Postal Union to freelance, and in 1959 went back to Warners to head their commercial department, where he directed commercials featuring Charlie the Tuna.
He eventually went back into the entertainment department as an animator in Jones" unit, and was chosen to finish two shorts under Chuck Jones" unit after Jones was fired. After Warner Brothers Cartoons closed in 1963, Monroe did many animation stints until he ended up at Chuck Jones Productions.
He would continue animating for Jones until his retirement.
