Twomey was born on March 2, 1923, and originated from Roseville, Illinois. He attended Roseville High School, where he managed the basketball team,[1] before attending the University of Illinois, where he graduated in 1941.[2][3] Twomey served in the U.S. Army Air Corps during World War II, from 1943 to 1945.[1] He worked as a corn farmer, and was a member of the Illinois Athletic Club.[4]