After Sigel died in 1966, Boesch bought out Houston Wrestling from Sigel's widow. Boesch had essentially been training for this opportunity for 20 years, and he quickly brought the organization to new levels of success and visibility. Under Boesch's leadership, Houston Wrestling quickly attained gained a reputation as one of the top regional wrestling promotions of its time. Promoters such as Gary Hart (World Class Championship Wrestling) and wrestlers such as Barry Darsow would repeatedly praise Boesch's acumen and honesty as a promoter and businessman. Boesch is also credited with the invention of mud wrestling, a concept he devised for a major match between Gus Sonnenberg and Harnam Singh in Seattle, Washington.