Conversation so far:
How did Ross Brawn's career get started?
His career in motorsport began in 1976 when he joined March Engineering in the town of Bicester as a milling machine operator.
How did he do there?
Soon afterwards he joined their Formula 3 racing team as a mechanic.
How long did he work as a mechanic?
Brawn was hired by Sir Frank Williams in 1978 as a machinist for the newly formed Williams team.
What did he do there?
He quickly moved up through the ranks, working in the R&D department with Frank Dernie and as an aerodynamicist in the team's wind tunnel.

Question: Did he switch carers again after that?
Self-contained rewrite: Did Ross Brawn switch carers again after being hired by Sir Frank Williams in 1978 for the Williams team?