Hollywood sound recordist from the early 1950s and, after 1972, sound re-recordist and dubbing mixer, sometimes billed as "Buzz" Knudson. Began dubbing CABARET (1972); other notable (non-nominated) credits include SAVE THE TIGER (1972), ELECTRA GLIDE IN BLUE (1973), SHAMPOO and THE OTHER SIDE OF THE MOUNTAIN (both 1975), BOUND FOR GLORY (1976), AIRPORT '77 (1977), EYES OF LAURA MARS (1978), THE BLUES BROTHERS (1980), TARZAN, THE APE MAN (1981), AN OFFICER AND A GENTLEMAN (1982), FLASHDANCE, TRADING PLACES and THE LORDS OF DISCIPLINE (all 1983), ROMANCING THE STONE and THE KARATE KID (both 1984), WITNESS, TWICE IN A LIFETIME, SPIES LIKE US and THE COLOR PURPLE (all 1985), THE KARATE KID, PART II, and NUTS (1987), BEACHES (1988), MAJOR LEAGUE, THE KARATE KID III and SEA OF LOVE (1989). He then retired from the business, having participated in the post-production of some of the finest films of the 1970s and 1980s.

Sound 1972: CABARET (w. David Hildyard)  Sound 1973: THE EXORCIST (w. Christopher Newman)  Nominated for Sound 1976: A STAR IS BORN (w. Dan Wallin, Robert J. Glass & Tom Overton)  Nominated for Sound 1977: CLOSE ENCOUNTERS OF THE THIRD KIND (w. Don MacDougall, Robert J. Glass & Gene S. Cantamessa)  Nominated for Sound 1977: SORCERER (w. Robert J. Glass & Jean-Louis Ducarme)  Nominated for Sound 1978: HOOPER (w. Don MacDougall, Robert J. Glass & Jack Solomon)  Nominated for Sound 1979: 1941 (w. Don MacDougall, Robert J. Glass & Gene S. Cantamessa)  Sound 1982: E.T. -- THE EXTRA-TERRESTRIAL (w. Don Digirolamo, Robert J. Glass & Gene S. Cantamessa)  Nominated for Sound 1987: EMPIRE OF THE SUN (w. Don Digirolamo, John Boyd & Tony Dawe)  Nominated for Achievement in Sound 1988: WHO FRAMED ROGER RABBIT (w. Don Digirolamo, John Boyd & Tony Dawe) 10 nominations, 3 Awards