He began his radio career on Windsor, Ontario's CKLW (800 AM) in 1969 and 1970, followed by WKNR (1310 AM) in late 1970 to early 1972, followed by WRIF FM (101.1) to April 1973.
St. John is best known for the 42 years he spent in the New York City radio market working for WPLJ, WNEW-FM, WAXQ and WCBS FM.
[1] St. John has done television voiceover work, including announcing for Dick Clark's New Year's Rockin' Eve from 2000 to 2010.
St. John is known for his conversational on-air style interspersed with bits of music trivia, along with "Collectible Cuts" from his extensive record library.
In late 1970 he moved across the border to WKNR and was then hired in early 1972 at the ABC-owned album-oriented rock (AOR) station WRIF until 1973.
For most of his years at WPLJ he was rated by Arbitron as the most-listened-to afternoon radio personality in America (source: ARB's "Drive-Time Dominaters").
St. John is the narrator (along with Smokey Robinson and Lionel Richie) of the two-CD set "The classic rock Story Volume 1: The 1960s".
[5] St. John and his wife live in San Diego where he broadcasts his '60s Gold and rock'n roll shows from a customized studio in a barn on their property.