Charles Alan Siebert was an American actor and television director. As an actor, he is best known for his role as Dr. Stanley Riverside II on the television series Trapper John, M.D., a role he portrayed from 1979 to 1986, and for his numerous appearances on the $25,000 Pyramid. After 1986, although he continued working as an actor, Siebert's career was focused on working as a director for episodic television for such shows as Xena: Warrior Princess, and Hercules: The Legendary Journeys.

Pyramid is an American game show franchise that has aired several versions domestically and internationally. The show was developed by Bob Stewart. The original series, The $10,000 Pyramid, debuted on March 26, 1973, and spawned seven subsequent Pyramid series. Most later series featured a full title format matching the original series, with the title reflecting an increasing top prize. The game features two contestants, each paired with a celebrity. In the game, the contestants and celebrities attempt to identify words or phrases through clues given by their teammates. The title refers to the show's pyramid-shaped gameboard, featuring six categories arranged in a triangular fashion. The various Pyramid series have won a total of nine Daytime Emmys for Outstanding Game Show, second only to Jeopardy!, which has won 13.