 In 2000 Ralf Schumacher joined the Williams Formula 1 team.Tost followed him, working for Williams' engine supplier BMW as Track Operations Manager until 1 January 2006, when the new Scuderia Toro Rosso team hired him as Team Principal.Following the 2007 European Grand Prix, at the Nürburgring in Germany, it was alleged that Tost assaulted driver Scott Speed over an incident on the track.