Stefan Rudolf Szefer (born May 8, 1942), also known as Steve Shafer or Shaffer,[2] is a former soccer player who played as a defender.
In 1968, Szefer moved to the Chicago Mustangs of the North American Soccer League.
He then moved to Dutch club MVV Maastricht for two seasons, scoring two goals as a left back.
In May 1976, Szefer joined the Chicago Cats of the American Soccer League,[6] but returned to the Sting for the 1977 season.
He returned briefly in 1980 to play for them during the 1980–1981 NASL indoor season.