De Lancie was born John Sherwood de Lancie, Jr. in Philadelphia, Pennsylvania, on March 20, 1948, one of two children born to John de Lancie (1921–2002), principal oboist of the Philadelphia Orchestra from 1954 to 1977, and … See more

De Lancie portrayed the almost-omnipotent character Q in Star Trek: The Next Generation (1987–1994), and in episodes of several subsequent Star Trek series taking place during that era. Q, notable for his chaotic, mi… See more

De Lancie is married to Marnie Mosiman, with whom he has two sons: Keegan (b. 1984) and a younger son (b. 1987).
De Lancie is an experienced sailor, spending time on the Pacific Ocean, which he said "so… See more