A right-hander, he batted left-handed and was listed as 6 feet 1 inch (1.85 m) tall and 190 pounds (86 kg).

In an afternoon game at Comiskey Park against the Detroit Tigers, Tiefenthaler relieved Dom Zanni (coincidentally, one of the players also involved in the Pierce trade) in the fourth inning and the bases loaded, with Detroit leading 2–1.

He then allowed a single to Al Kaline before, charged with two earned runs, he left the game with the White Sox down 7–1.

In the majors, Tiefenthaler had a 0–0 record, with a 9.82 earned run average, in three games and 32⁄3 innings pitched.

This biographical article relating to an American baseball pitcher born in the 1930s is a stub.