 His successful efforts to organize exhibitions in Sweden with Arnold Palmer in 1968 and Jack Nicklaus in 1969, was followed by the professional invitation tournament Volvo Open, which took place in Sweden in 1970 and 1971.In 1973 the Scandinavian Enterprise Open tournament was established, with Tumba as its founder, and it soon became one of the richest ones on the European Tour.During the period of time for Tumbas golf career, the number of members in Swedish golf clubs increased 50 times, from around 12,000 at the beginning of the 1960s to approximately 600,000 in the middle of the 1990s.