Baker appeared on the New York City public radio station WNYC in 1977. He was a guest on Seminars in Theatre on July 28, 1977 on the FM station. On August 3, 1977 he was on the show Conversations From Circle in the Square on the AM station. This show was repeated November 23, 1977 on the AM station and November 24, 1977 on the FM station.
One of Baker's early TV appearances was in The Teaching, an original hour long religious drama produced by the Jewish Theological Seminary in association with NBC. It was the third in a series of four presented circa 1970. The story, by Robert Crean, concerns Nan & Phil Golden (Kim Hunter & Norman Rose) who've raised their son Samuel (Lenny Baker) in the beliefs and traditions of their religion. The drama is about what happens when Samuel acts on his religious ideals. Since he believes he is "his brother's keeper" he participates in a protest for improved wages for the cafeteria workers at his college, risking expulsion from school. His actions offend the middle class values of his parents. The program ends with the family sharing in a religious service, with the son & father each blessing the other. Samuel then leaves to join the picket line. The program, produced & directed by Martin Hoade, aired April 5, 1970 during the late afternoon.
Baker starred in a comedy pilot called The Rubber Gun Squad for ABC that aired September 1, 1977. Lenny Baker and Andy Romano appeared as Eddie and Chopper, misfit cops assigned to Central Park. Also in the cast were Tom Signorelli (Sgt. O'Leary), Betty Buckley (Rosie), Alan Weeks (Jerome), Paul Jabara (Austin), Frank Simpson (Dewey), Kenneth McMillan (Capt. Egan), Don Scardino (Mooney) and William Robertson (Mr. Griffin). The show was written by Sid Dorfman & Simon Muntner, directed by Hy Averback and produced by Philip D'Antoni and Sonny Grosso. The 30 minute show wasn't picked up by the network.
In 1977 Mr. Baker appeared on the Public Radio drama series Earplay in Richard Howard's "The Lesson of the Master" with Nancy Marchand as Edith Wharton and Baker as Mr. Roseman.
In 1973 Lenny Baker recorded an audio book version of Kenneth N. Taylor's Living Bible version of The Gospel According to St. Mark for Voice Over Books (VOB 01073).