Klaus Kretschmer officiated thousands of professional soccer games for over 20 years. He is the first Pacifican to have been inducted into the Pacifica Sports Hall of Fame as a pro soccer referee. Klaus officiated games in which soccer greats Pele, Franz Beckenbauer, George Best, Rick Davies, Kyle Roth and many others played. He was a referee with the North American Soccer League and the Major Indoor Soccer League. In 1964, he helped build and organize the Concordia Sport Club of San Francisco. His love of the game inspired him to help develop the AYSO soccer program in Pacifica where he coached and conducted referee clinics.