In 2009, she appeared in Armando Iannucci's BBC Films political satire "In The Loop", co-starring with Peter Capaldi, Tom Hollander, Chris Addison, James Gandolfini, and Mimi Kennedy, a quasi-spinoff of Iannucci's BBC TV series "The Thick of It". She plays Liza, a State Department assistant in the movie. From 2012, Chlumsky has played Amy Brookheimer, aide to Julia Louis-Dreyfus's character in HBO's "Veep", also produced by Iannucci. In June 2012, she starred in the world premiere of David Adjmi's 3C at the Rattlestick Playwrights Theater in New York.