[1] He attended the Goodman School of Acting in Chicago on a scholarship for three years and graduated from the Actors Studio.
His Broadway credits included Winged Victory (1943), Yellow Jack (1944), Galileo (1947), Sundown Beach (1948), My Name Is Aquilon (1949), The Man (1950), and The Ponder Heart (1956).
In 1966, he played a barber on the TV Western Series Gunsmoke in “Gunfighter, RIP” (S12E6).
Hanmer won a Donaldson Award for his performance when the Actors Studio produced Sundown Beach (1948).
He was first married to actress Jocelyn Brando, and, later, to Susan Tucker Huntington.