In 1964 Petersen joined the Beau Brummels, whose first two singles, "Laugh, Laugh" and "Just a Little", reached the United States. top 20. He appeared with the band in the 1965 science-fiction/comedy movie Village of the Giants, which was featured in a 1994 episode of Mystery Science Theater 3000. Petersen also appeared with the band as The Beau Brummelstones on The Flintstones television animated sitcom in the season six episode "Shinrock A Go-Go," which originally aired on December 3, 1965.
Petersen left the group after their third album, Beau Brummels "66, to join Harpers Bizarre.
Formerly known as the Tikis, Harpers Bizarre had a top 20 hit with a remake of Simon & Garfunkel"s "The 59th Street Bridge Song (Feelin" Groovy)" in 1967. The group broke up in 1970, but Petersen returned for a reunion album in 1976.
Petersen also occasionally reunited with the Beau Brummels. In 1975, he played with and recorded on the band"s self-titled album.
Petersen married Roberta Templeman, sister of Harpers Bizarre"s Ted Templeman, in 1969.
Roberta Templeman became a vice president at Warner Brothers Records in the 1980s. Petersen died on November 11, 2007.