When the team folded at the end of the 1989 season, he moved on to Leyton House, staying as they reverted to March Engineering - during this period, he is perhaps best remembered for vaulting the pitlane wall and running on to the track when Ivan Capelli finished 2nd in the 1990 French Grand Prix.
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A few months later Adrian Newey joined Williams from Leyton House and Fisher worked with him until Newey left in 1997 to join McLaren.