Richard Horvitz

Richard Steven Horvitz voices Moxxie and his father in Helluva Boss and also stands as the series' voice director.

He does numerous voice roles for minor characters such as Eddie, the Carnival Imp (S1E2), the blue-haired nurse from the pilot, and the demon child in St. An's Hospital with his mother (S2E4).

Trivia

 * He is known for his energetic high voice roles in various cartoons and video games such as the titular character from Invader Zim, Daggett from The Angry Beavers, Billy from The Grim Adventures of Billy &amp; Mandy, Kaos from Skylanders, and Raz from Psychonauts, and various others. He also was the narrator for the audio book version of Goosebumps: Attack of the Mutant
 * Kellen Goff, who was a student of Horvitz in his voice-over classes, reached out to him for Helluva Boss.
 * Horvitz started out in musical theater way back when he was 13 years old. Incidentally, this is a trait he shares with Moxxie, as both are involved in musical theater. It was also the primary reason of why he was interested in participating in the project in the first place.
 * "The Circus" premiered on Horvitz's 56th birthday.