One Rick Rempel: metal worker, appeared in one build in Season Four, debuted in S04E20 (El Camino/White Cap truck), quit during S04E21 to return to Canada Scott Parker: appeared in Seasons Two through Four, quit during S04E10 after staying to help complete the '61 Impala Bubbletop build Mike Curtis: machine shop supervisor, appeared in Seasons One and Two, fired during S02E22 ('59 Chevy Low Rider) for working for competitor Chip Foose on the side. Roy Schmidt: metal worker, appears in Seasons One through Three, died of lung cancer on Oct. 27th, 2005 at the age of 64 during filming of S04E03 ('54 Corvette & '55 Chevy) Thomas Loddby: mechanic, appeared in Seasons One through Five, left during S03E02 (Max Hemi) to start a shipping business, returned in S04E11 ('40 Ford) working on a part-time basis Al Simon: chassis builder, appears in Seasons One through Five, quits during S02E14 (Bud Light car), returns during S02E22 ('59 Chevy Low Rider), and leaves again during S05/E08 ('59 Corvette) "Speedy" MacDonald: apprentice, appeared in Seasons Four and Five before leaving during S05E06 (Sobe Mercury Wagon) to return to Connecticut Jon Rockwell: metal fabricator, appeared in Season Four, debuted in S04E12 ('40 Ford), gone when Season Five began Sean Dooley: metal worker, appeared in one build in Season Two ('65 Mustang), fired during S02E01 for insubordination Jimmy Hudson: metal fabricator, appeared in Season Four, debuted in S04E11 ('40 Ford), quit during S04E18 ('40 Ford Woodie) for personal reasons Brad Johnston: fabricator, appeared in Seasons Two through Four, debuted during S02E18 (Hildebrandt Car), quit during S04E09 ('61 Impala Bubbletop) after being confronted about excessive absenteeism Liz Miles: apprentice, appeared in Season Five, debuted in S05E07 ('59 Corvette), fired during S05E08 reportedly over an alleged salary dispute and conflict with Boyd's wife Jo Tony Piro: apprentice, appeared in Season Four, debuted S04E04, laid off S04E05, returned as an intern on S04E06 (all '56 Chevy), and eventually fired S04E19 ('40 Ford Woodie) for lack of experience Jon Mayo: machinist, appeared in Seasons One and Two, quit during S02E08 ('42 Woodie) to move to Hawaii Kevin Christianson: machinist, appeared in all five seasons Chris Campbell: driver, appeared in Seasons Two through Four, fired during S04E04 ('56 Chevy) for multiple accidents and mishaps Ben Vasquez: fabricator and assembler, appeared in Seasons Four and Five Ken Whitney: assembler/electrical, appeared in Seasons Two through Four, had his own business named Wire 1