He sang with a male quartet called the Cadets on several Chicago-based radio shows, including "The Breakfast Club With Don MacNeil."
He later formed the Jack Halloran Quartet, which appeared on the television programs "Dave Garroway at Large" and "The Pat Buttram Show."
Relocating to Hollywood, Halloran became a choral director for films, records and television, working with such entertainers as Roy Rogers, Pat Boone, Ray Charles, Frank Sinatra and Dean Martin.
[2] Simeone and Onorati claimed and received joint composition credits along with Katherine Kennicott Davis,[2] although the two did not actually compose, write, or arrange it.
In the mid-1980’s, Halloran taught sight-singing and group harmony classes for vocalists at the Dick Grove School of Music in Southern California.