In his only Major League Baseball service, he appeared in two games as a first baseman and pinch hitter over a nine-day period for the 1952 Chicago White Sox, batted five times, and had one single — off Dick Littlefield of the St. Louis Browns in his final MLB plate appearance.

[1] Listed as 6 ft 3 in (1.91 m) tall and 200 lb (91 kg), Landenberger batted and threw left-handed.

He batted an even .300 in 1,389 games played (with 1,512 hits) during his minor league career, spent mostly in the White Sox system.

He began the 1960 campaign as skipper of the Selma Cloverleafs of the Alabama–Florida League, but he was sent home in mid-July after a medical examination revealed that he was suffering from acute leukemia.

[2] He entered the Cleveland Clinic, but died on July 28, the day before his 32nd birthday, from a cerebral hemorrhage[4] and the effects of leukemia.