She spent her early childhood in Bathgate, Scotland, before moving to Perth, Australia with her family in the early 1980s.
Gasteyer began her career at Northwestern University; she initially enrolled as a voice major, but later switched to theater studies when she started to get involved with the campus' improv comedy group.
After relocating to , when she was four, her mother married L.
Next, she voiced a suburban elf mother in 's opposite and.
Actress Parker Posey was born two months premature in Baltimore, Maryland, to Lynda Patton and Chris Posey.
She is married to comedian Brad Hall and shares two sons with him.