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.
Following a surveying effort by Andrew Ellicott representing the Pennsylvanians and James Clinton and Simeon DeWitt representing the New Yorkers, the western edge of New York was set at 20 miles (32 km) east of Pennsylvania's Presque Isle, a small peninsula off the coast of Erie, Pennsylvania.
In the mid-1960s, he was a featured performer for Fred Waring and the Pennsylvanians.
William Penn had never taken sides in disputes between tribes, but by this purchase, the Pennsylvanians were favoring the Iroquois over the Lenape.