Antônio Reginaldo Pizzonia Júnior (born 11 September 1980) is a Brazilian professional racing driver who has raced in Formula One and the Champ Car World Series. Born in Manaus, he started his car racing career in the Formula Vauxhall Junior series in 1997 and then progressed through various junior formulae, winning the Formula Vauxhall Junior Winter Festival in 1997, the Formula Vauxhall Junior and Formula Renault Winter Festival in 1998, the Formula Renault 2.0 UK in 1999, and the British Formula 3 Championship in 2000. For 2001 and 2002, he entered the Formula 3000, with his best championship finish being sixth in 2001. In 2003, he was signed by the Jaguar Formula One team, but following poor results, was released during the season. In 2004, he replaced the injured Ralf Schumacher at Williams in several events, securing his first Formula One points in the process. In 2005, he replaced Nick Heidfeld at Williams, but was released from his contract at the end of the season. Since then, he has competed in multiple series, such as the Champ Car World Series, the Superleague Formula, Stock Car Brasil, and the FIA GT1 World Championship. Racing career Pre-Formula One From 1991 to 1996 he competed in various karting series. In 1997 he moved to Britain and competed in Formula Vauxhall Junior; Pizzonia placed second, and won the Winter Festival. In 1998, in addition to taking the Championship in Formula Vauxhall Junior, he won the Formula Renault Winter Festival. His 1999 season was even more successful, winning the Formula Renault 2.0 UK series and finishing second in the Formula Renault 2.0 Eurocup. In 2000, Pizzonia took five wins on his way to winning the British Formula 3 Championship. For 2001, Pizzonia switched to the Formula 3000 series, winning one race and finishing sixth in the championship. Formula One In 2002, Pizzonia was hired as test driver for Williams, but also continued in F3000, placing 8th. After impressive testing performances, he was signed by the Jaguar team to partner Mark Webber for 2003, replacing the axed Pedro de la Rosa . However, following a string of poor results, he was dropped late in the season and replaced by Minardi's Justin Wilson. In 2004 he returned to Williams as test driver. Before the German Grand Prix, it was announced that Pizzonia would take over from Marc Gené, who had been filling in for the injured Ralf