From Wikipedia, the free encyclopedia. Joan Pringle (born June 2, 1945 in New York City, New York) is an American actress best known for playing vice principal "Sybil Buchanan" in the TV series The White Shadow. During the third and final season her character was promoted to principal. She also appeared in many TV shows ranging from The Waltons to Kojak. She was married to fellow actor Theodore Wilson from January 1980 until his death in July 1991. She and Wilson co-starred in The White Shadow ...