He also served in the United States Marine Corps during World War II and received the Purple Heart medal for injuries sustained in the Battle of Saipan.

[1] He briefly played professional baseball for the Scranton Red Sox during the summer of 1943.

[2] Koniszewski then served as a lieutenant in the United States Marine Corps during World War II.

[4] After his playing career ended, Koniszewski worked for 18 years as a coach at the University of Scranton.

After his coaching career ended, he was the athletic and recreation director at Clarks Summit State Hospital for 34 years.