was an American actor, comedian, and director who is best known for his television role as Maxwell Smart (Agent 86)
on the NBC
comedy series Get Smart
. He is also known for his voice roles as the title character on the semi-educational animated series Tennessee Tuxedo and His Tales
and as Inspector Gadget
on the animated series Inspector Gadget
He voiced Principal Hickey in the Disney animated series Pepper Ann and played Brain in the 1999 Disney film Inspector Gadget, a nod to his voice role as Inspector Gadget in the animated series.