[citation needed] She was educated at the independent Wycombe Abbey School and at Christ Church, Oxford, where she studied English Literature, receiving a first class degree.

Also in 1999, she played the daughter of newspaper magnate Max Van der Vuurst, Hilde, in the Heat of the Sun story "The Sport of Kings".

In 2001, she moved to the United States and was cast as Donna Barnes on the HBO comedy series, The Mind of the Married Man.

She also had recurring roles on Sleeper Cell, CSI: NY, and Terminator: The Sarah Connor Chronicles.

In 2007, Walger appeared in the original Broadway production of Frost/Nixon, as Charlotte Cushing, David Frost's then-girlfriend.

[6] The following year, Walger was cast in the new Rhimes series The Catch, co-starring opposite Mireille Enos and Peter Krause.

In 2019, Walger starred as NASA astronaut Molly Cobb in the first season of the Apple TV+ original science fiction space drama series For All Mankind.