Keller was a member of the original Pennsylvanians, the California Nighthawks, and orchestras led by Charlie Kerr, Charles Previn, Josef Pasternack, Earl Bernnett, Marshall Van Poole, Harry James, and Carmen Cavallaro.
His fellow members in the Charles Kerr Orchestra included Tommy Dorsey, Eddie Lang and Joe Venuti.
Keller was also a member of the Townsmen, a quartet (vibes, guitar, saxophone, bass) which played at the Warwick Hotel.
Photos of the Townsmen were often featured on the covers of sheet music that the group performed.