A native of St. Louis, Missouri, Koenig threw and batted right-handed and stood 6'3" (190 cm) and weighed 210 pounds (95 kg) in his playing days.

He became a manager in the Cardinal farm system in 1962, with the Winnipeg Goldeyes of the Class C Northern League.

Koenig then came to the Major Leagues as a coach for Angel skipper Lefty Phillips for 1970–71.

He then was a Major League coach for the Cardinals (1976), Texas Rangers (1977–82), Chicago Cubs (1983), and Cleveland Indians (1986).

Koenig later worked in the Atlanta Braves' farm system as a roving coach and manager at the Rookie level.