With a background in theater, Krolzyk entered television starting in the 1970s and appeared in multiple episodes of the crime series Derrick and Tatort (usually as janitors, clerks, or waiters), as well as in commercials (as spokesman for Melitta coffee filters). As a voice actor, he dubbed Rip Torn in For Better or Worse, secondary roles in later Columbo installments, and other supporting and bit parts (often bartenders). In animation, he dubbed Captain McAllister and others on The Simpsons, the Sandman and Kraven the Hunter on the 1980s Spider-Man, Splinter and Bebop on Teenage Mutant Ninja Turtles, and a town councilor and ensemble roles in the German animated feature Jester Till.
Muppet dubbing credits
- Die Muppets feiern Jim Henson (The Muppets Celebrate Jim Henson): Fozzie Bear
- Muppets aus dem All (Muppets from Space): Waldorf
- Kermit der Frosch (Kermit's Swamp Years): Waldorf
- Muppets Der Zauberer von Oz (Muppets' Wizard of Oz): Waldorf