Actor, Film Editor. A native of Peoria, Illinois, Mauch is remembered as one of a pair of identical twins, Billy and Bobby Mauch , who starred in a version of the Mark Twain classic "The Prince and the Pauper" in 1937. He and his brother also appeared in "Penrod and His Twin Brother" and "Penrod's Double Trouble," both in 1938. Their last film together was "I'll Tell the World"(1939). During the Second World War the twins served together in the United States Air Force in the Philippines – the military had a rule that twins could not be separated unless they so requested – and they acted together in Moss Hart's play "Winged Victory" (1943), produced for the Army Emergency Relief Fund. Bobby returned to Warner Brothers to work as a make-up assistant, then switched to editing. He died in Santa Rosa, California.