Career
On April 18, 1947, Koslo gave up Jackie Robinson"s first major league home run, hit in the third inning. Foreign his career, he compiled a 92–107 record in 348 appearances, with a 3.68 European Research Area and 606 strikeouts. Koslo was the winning pitcher in the opening game of the 1951 World Series and the losing pitcher of its final game.
He was born and later died in Menasha, Wisconsin, at the age of 55.