- Was in the orginal cast of the First National Tour of Mel Brooks' The Producers, playing Mr. Marks as well as many other characters, and understudying the roles of Max Bialystock and Roger Debris, both of which he performed several times.
- Toured in "Les Miserables" as the conniving "Master of the House" Thenardier.
- Brother of Nina K. Noble.
- Creator of the Audition Psych 101 workshop, which addresses the mental side of the audition process.
- Author of: "Letters from Backstage" (a behind-the-scenes chronicle of life on the road with two Broadway tours), "Audition Psych 101" (based on the popular workshop on the mental side of the audition process), "The Stage Actor's Handbook: Traditions, Protocols, and Etiquette for the Working and Aspiring Professional" (Roman & Littlefield, 2022).
- Kostroff was the seventh actor to appear as the character Max Bialystock in Mel Brooks' hit musical, "The Producers," following Nathan Lane, Brad Oscar, Ray Wills, Henry Goodman, Jon Treacy Egan, and Louis J. Stadlen.
- Mr. Kostroff sang the solo in the opening credits for HBO's "The Plot Against America.".
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