Hallee Leah Hirsh (born December 16, 1987)[1] is an American actress perhaps best known for her roles as Mattie Grace Johnson on JAG, Daley in the children's series Flight 29 Down, and as the adolescent and young adult Rachel Greene on ER.

[2] Hirsh and her family moved frequently, first to Pensacola, Florida, where Hallee landed her first role after her first audition in Orlando for Disney's Big Red Boat cruise line.

Hallee lived with her father in the Oakwood Toluca Hills apartment complex, alongside other notable child stars such as Hilary Duff, a time which she has referred to as "an important part of her life".

In the ER series finale, aired April 2, 2009, titled "And in the End", Hirsh's character returned as a candidate interviewing for medical school, bringing the Greene family history full circle.

Following her one main season on ER, Hirsh appeared in the recurring role of Matilda "Mattie" Grace Johnson, for 17 episodes (2003-05) on the television series JAG.