In 2004, Jessi graduated from WyoTech in the Collision & Refinishing Core Program at the top of her class. Combs then added the Street Rod Fabrication and Custom Fabrication and High Performance Powertrain programs to her realm of expertise. From 2005 to 2008, Jessi appeared on the Spike show “Xtreme 4x4 ” before being cast as a co-host of the show. Prior to appearing on “Xtreme 4x4” Combs appeared on the TLC version of OVERHAULIN' as a guest fabricator. In July of 2009, Discovery Channel added Jessi to the cast of MythBusters while co-host Kari Byron left on maternity leave. Combs can also be seen as one of the hosts on Velocity’s ALL GIRLS GARAGE.