- Older half-brother of actor Nicolas Koster and Peter Koster.
- Son of actress Kató Király and director Henry Koster.
- Stepson of actress Peggy Moran.
- Father, with Lucy Fried, of Kevin Koster.
- Grandson of Ernö Király and Hermine Solti.
- Teaches History of Media at Cal State University, Channel Islands, in Camarillo (January 2007)
- Wrote "The Budget Book for Film and Television", textbook for production managers and producers (January 2004)
- Lectures on Media History at Cal State University, Channel Islands. (January 2011)
- (1992-) Teaches film production at UCLA Extension, USC
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