Sir John Arthur "Jack" Brabham, OBE (born 2 April 1926) is an Australian racing driver who was Formula One champion in 1959, 1960 and 1966.
In a self developed Cooper Climax, Brabham won the Formula One championship in 1959 and 1960. The years after that though, engines were limited to 1500cc and Jack was unable to win a single race during that period. When in 1966 the regulations allowed 3000cc engines he was able to win again in a Brabham-Repco in 1966. Jack was the first and only one to win the F1 championship in his own car, having founded his Brabham team in 1962.
www.jackbrabham.com/

Birth of Jacques Villeneuve at St Jean sur Richelieu, Canada. Jacques is the child of F1 legend Gilles Villeneuve. Jacques is the winner of the CART championship and the Indy500 in 1995. He entered Formula One in 1996 with Williams and immediately took pole position in his first race. He was runner up in the championship that year and was crowned champion in 1997. Unsuccessful seasons followed at BAR and Sauber after which he opted to join NASCAR in 2007.

Former Argentinian F1 driver, born in Santa Fé, Argentinia

Flavio Briatore, the Renault F1 Team Boss, was born on 12 April 1950 in Verzuolo, Italy.

Christijan Albers was born on April 16, 1979 in Eindhoven, the Netherlands. He made his F1 debut in 2004 as a test driver for the Minardi F1 Team and continued in 2005 as a race driver for the same team. For 2006, the Dutchman signed a contract with the new Midland F1 Team.
www.christijan.com/en/