He served in the United States Army during World War II, from January 1942 to November 1945,[1] and earned three Purple Hearts after being wounded four times.

Shortly after the war, he took a job as assistant professional at Philmont Country Club in Huntingdon Valley, Pennsylvania.

He won eight times on the tour, including three wins in 1956, when he topped the money list with earnings of $72,836.

In 1954, Kroll became the third player in PGA Tour history to shoot a 60, joining Al Brosch (1951) and Bill Nary (1952).

PGA Tour playoff record (1–7) Note: Kroll never played in The Open Championship.