Kat preivously worked as an intern for 3 months at Turner Feature Animation in 1995, working on visual development, storyboard, rough animation, and assistant animation. She then moved on to work for Walt Disney Animation Studios (1996-2002) as an animation assistant and worked on 6 of their feature films. Kat was employed by DreamWorks Animation for one year (2002-2003) as an animation assistant on Sinbad: Legend of the Seven Seas, after which she was fully employed by the studio in 2003 and worked on 3 more of their feature films.
Kat studied Art/Art Studies, General at the University of California, Santa Barbara (1991-1993) and Bachelor of Fine Arts (BFA), Character animation at California Institute of the Arts (1993-1996) and also a guest lecturer for Storyboarding at SAS Athens, Greece, in 2011 as part of her teaching experience.
- Dragons: gift of the Night Fury (video short) (2011) - Story artist, storyboard artist - as Kathleen Thorson
- Megamind (2010) - Story artist (uncredited)
- Kung Fu Panda (2008) - Additional story artist - as Kathleen Thorson
- Bee Movie (2007) - Storyboard artist - as Kathleen Thorson
- Sinbad: Legend of the Seven Seas (2003) - Rough inbetweener - as Kathleen Thorson
- Treasure Planet (2002) - Rough inbetweener - as Kathleen Thorson
- Atlantis: The Lost Empire (2001) - Additional rough in-betweener artist - as Kathleen Thorson
- The Emperor's New Groove (2000) - Rough inbetweener artist: Paris - as Kathleen Thorson
- Tarzan (1999) - Breakdown artist: "Jane" - as Kathleen Thorson
- Mulan (1998) - Inbetweener: additional clean-up animation - as Kathleen thorson
- Hercules (1997) - Inbetweener artist: "Zues", "Hera" and "Muses" - as Kathleen Thorson
- Kung Fu Panda Holiday (TV short) (2010) - Story artist, storyboard artist - as Kathleen Thorson
The Guardians face off against Pitch Black and Jack unknowingly helps Pitch escape, North is furious.