Ampil has performed in several West End musicals, including Miss Saigon, Jesus Christ Superstar and Avenue Q, and she played the role of Fantine in Les Misérables in London until 21 June 2008.
In 2007 she participated in the Israeli version of the stage show, Avenue Q, as a satire of herself.
That same year saw her star in the national tour of the Broadway musical, Avenue Q, playing the roles of "Kate Monster" and "Lucy the Slut".
Other credits include the world premieres of The Yellow Wood (directed by BD Wong), Chaplin, and The Tragic and Horrible Life of the Singing Nun. Regionally, he has appeared in productions of The 25th Annual Putnam County Spelling Bee, Avenue Q, Oliver!, Ragtime, and Children of Eden.
Saks Fifth Avenue | Fifth Avenue | Park Avenue | Madison Avenue | Park Avenue (Manhattan) | Claiborne Avenue | Woodbine Avenue | Fairfax Avenue | Carrollton Avenue | St. Charles Avenue | Seventh Avenue | Constitution Avenue | Hennepin Avenue | Avenue Q | Vermont Avenue | Michigan Avenue | Cheltenham Avenue | Shattuck Avenue | Seventh Avenue (band) | The Prisoner of Second Avenue | Rustaveli Avenue | Rizal Avenue | Massachusetts Avenue | Lexington Avenue | Huntington Avenue | University Avenue | St. Clair Avenue | Michigan Avenue (Chicago) | Lloyd George Avenue | La Brea Avenue |
The revue continues the series' tradition of spoofing contemporary Broadway shows and personalities, including the shows Thoroughly Modern Millie, Hairspray, Wicked, Avenue Q, Cabaret, Fiddler on the Roof, La Cage aux Folles, and Bombay Dreams, and personalities Christina Applegate, Robert Goulet, Cherry Jones, and Kathleen Turner.
He was nominated for Best Supporting Actor in a Musical for his appearance in Jailhouse Rock and for Best Takeover in a Role in a theatrical production of The Rat Pack as Sammy Davis, Jr. and Best Ensemble Performance in Avenue Q.
Barnhart also worked as a puppeteer in Johnny and the Sprites, a Disney Channel children's show created by her Avenue Q co-star John Tartaglia.
The Original Taking Notes Cast comprising 45 students from various areas of the UK, who worked with a number of currently established and successful Musical Theatre artists including Julie Atherton (Avenue Q), Oliver Tompsett (Wicked), Clare Foster (The Bill, Avenue Q), Sam Buntrock (Sunday in the Park with George) Keiran Hill (RSC) and Paul Spicer (The Last 5 Years).