The university agreed and Guelker, working on a shoestring budget of $200 played five club (4–1 record) games that season.

[1] Guelker continued to coach St. Louis through the 1966 season, taking the team to a 95–10–5 record and winning five championships (1959, 1960, 1962, 1963, 1965).

In 1966, Guelker left SLU and moved to Southern Illinois University Edwardsville (SIUE) to establish the soccer program and serve as the Cougars' athletic director.

In addition to coaching, Guelker held various executive positions at the local and national levels.

In 1946, he became the Executive Secretary for the Catholic Youth Council, Archdiocese of St. Louis, a position he held until 1969.

The Catholic Youth Council of St. Louis holds an annual “Bob Guelker Soccer Tournament” in his honor.