In the summer of 1991 Harvey Postlethwaite joined the team to design an F1 car and Mercedes funded a vast new factory at Hinwil.
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Mario Theissen (born 17 August 1952 in Monschau, Germany) is the former BMW Motorsport Director and was team principal of BMW Sauber, the company's Formula One team from 2005 until 2009, when BMW sold the team back to Peter Sauber.
At this stage, Kaiser was a co-owner of the Sauber Formula One team (along with founder and team principal, Peter Sauber and Red Bull owner Dietrich Mateschitz), and Kaltenborn was employed to take charge of the team's corporate and legal affairs.