Jantzen was born in Chicago in 1890.
He began playing professional baseball in 1910 with the Vincennes Alices in the Kentucky–Illinois–Tennessee League. In 1911, he continued in the minor leagues, playing for Vincennes as well as the Cairo Egyptians.
In 1912, he reached the major leagues, playing for the St. Louis Browns. He appeared in 31 games for the Browns between June 29 and September 13. He was a right fielder and compiled a batting average of .185 with 22 hits, 10 runs, one home run, and one RBI. In his 31 games in right field, he was never charged with an error and finished his career with a perfect 1.000 fielding percentage.

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