Richard Derr was an American actor who worked on stage, screen and television, performing in both starring and supporting roles. A life member of The Actors Studio, Derr landed the majority of his leading roles on stage; on the screen, he was primarily a character actor. Beginning in the 1950s, most of Derr's work was done on television. In 1955 he sang in the lead role in the Broadway musical Plain and Fancy. In 1965 he played the role of Dr. Dwyer in the three-part serial, "The Adventures of Gallegher," on Walt Disney's Wonderful World of Color.