Thierry "Hazard" Gesteau (born 7 June 1962) is a French singer-songwriter Gesteau was born in Compiègne, and grew up in Sèvres. During the 1980s, he became the singer of the band GPS, an acronym of Garage Psychiatric Suburban (the group's guitarist, Tom "Backerfix" Darnal, became Mano Negra's keybo...