Adler's journey began in Brooklyn, where he honed his craft and forged a successful career in Broadway. He famously stage-managed legendary productions such as My Fair Lady, featuring a young Julie Andrews, and the original Annie musical. Despite his extensive experience in the industry, it was only after receiving a casting call for the film The Public Eye in 1992 that he made his acting debut.

His portrayal of Hesh in The Sopranos established him as a favorite among viewers and led to additional roles in shows like CBS’s The Good Wife and FX’s Rescue Me. He also made memorable appearances on other prominent series, including Curb Your Enthusiasm and The West Wing.

In addition to his screen success, Adler returned to his theatrical roots, acting in Broadway productions like Taller than a Dwarf and Fish in the Dark. Adler's life and work serve as a testament to a remarkable career, bringing joy to audiences for generations, and he passed peacefully in his sleep, surrounded by loved ones. His impact on film and theater will be deeply missed.