Stage work Vlastnik was 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.
Television work He has guest-starred on episodes of the television series
Law & Order,
The Good Wife,
Boardwalk Empire,
Person of Interest, and
Elementary.
Writing Vlastnik is the co-author of the books
Broadway Musicals and
Sitcoms, both published by
Black Dog & Leventhal Publishers. In 2021, Vlastnik co-authored
The Art of Bob Mackie, about the life and career of American fashion designer and costumier
Bob Mackie. ==Filmography==