He made his MLB debut on May 18, 1989, for the St. Louis Cardinals, pitching 3.1 innings, giving up one hit and striking out three versus the Houston Astros.

He pitched in seven more games (one start) and gave up 19 earned runs in 13.1 innings to finish with an 0–2 record and a 12.83 ERA.

He pitched 1.2 innings, giving up three hits, three walks, three earned runs, and struck out one batter.

[4] After his major league days he served as a scout for the Tampa Bay Devil Rays and worked as a player agent.

[5] Kinzer returned to scouting in 2010, with the Florida/Miami Marlins, then joined the Atlanta Braves with the same role in October 2015.