- Son of director Don Siegel (who used him in several films)
- Son of actress Viveca Lindfors, who was married to George Tabori from 1954 to 1972.
- Appeared with his mother on stage in "An Evening with Viveca Lindfors and Kristoffer Tabori" in 1980.
- A frequent player on the CBS Radio Mystery Theater (1974 - 1982).
- Produced and directed a number of TV projects, primarily for Hallmark Channel and Hallmark Movies and Mysteries (now Hallmark Mystery Channel), using the pseudonym K.T. Donaldson. The pseudonym is derived from his birth name Kristoffer Donald Siegel, and his stepfather George Tabori's surname.
- Was engaged to actress Barbara Crampton (1995)
- Ex-brother-in-law of Sally Geeson.
- Brother of Anney Siegel-Wamsat.
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