Frank Vlastnik (born May 30, 1965 in Peru, Illinois) is an American theatre and television actor. He is best known as an original cast member in the short-lived musicals Big, Sweet Smell of Success, and A Year with Frog and Toad on Broadway, and Off-Broadway in Stephen Sondheim's musical Saturday Night. His big break came when he was cast as the original understudy for the leading role in Big. He later starred on and off-Broadway in A Year with Frog and Toad in which he played the 'Snail with the Mail', and was featured on the cast album. He also guest-starred on episodes of Law & Order, The Good Wife, Boardwalk Empire, Person of Interest, and Elementary. He is the co-author of the books "Broadway Musicals" and "Sitcoms", both published by Black Dog & Leventhal/Hachette.

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