During the 1940s, Schallert was a member of Los Angeles' 'The Group Theatre'--a West Coast version of New York's 'The Actor's Studio'--where he appeared in a production of W. Somerset Maugham's "Rain" directed by Charles Chaplin.
Had a supporting role in In the Heat of the Night (1967), and later made a guest appearance in an episode of the TV series, "In the Heat of the Night" (1988).
He has performed hundreds of voice-over jobs over the years.
He made guest appearances on both "Twilight Zone" (1959) and "The Twilight Zone" (1985) as well as appearing in Twilight Zone: The Movie (1983).
Interviewed in Tom Weaver's book, "They Fought in the Creature Features" (McFarland & Co., 1995).
Is also a composer, pianist and singer.
Martin Lane, Schallert's character on "The Patty Duke Show" (1963), was ranked #39 in TV Guide's list of the "50 Greatest TV Dads of All Time" [20 June 2004 issue].
Of Schallert's myriad movie and TV roles, he has said the one individual role for which he still receives the most recognition is as Nilz Barris, Federation Undersecretary Of Agricultural Affairs, in the "Star Trek" (1966) episode "The Trouble With Tribbles".
President of Screen Actors Guild (SAG). [1979-1981]