Gerhard Berger , ( born August 27 , 1959 in WÃ rgl ) is an Austrian former Formula One racing driver , who used to own 50 % of the Scuderia Toro Rosso Formula One team until he sold his share back to energy drink owner Dietrich Mateschitz . Gerhard Berger , ( born 27 August 1959 in WÃ rgl ) is an Austrian former Formula One racing driver , who previously owned 50 % of the Scuderia Toro Rosso Formula One team until he sold his share back to energy drink owner Dietrich Mateschitz in November 2008 .