Question: Which Formula One World Champion had a teammate named Richie Ginther?

Documents:
source: 1962 Italian Grand Prix
text: 1962 Italian Grand Prix The 1962 Italian Grand Prix was a Formula One motor race held at Monza on 16 September 1962. It was race 7 of 9 in both the 1962 World Championship of Drivers and the 1962 International Cup for Formula One Manufacturers. The 86-lap race was won by BRM driver Graham Hill after he started from second position. His teammate Richie Ginther finished second and Cooper driver Bruce McLaren came in third.

source: Graham Hill
text: Graham Hill Norman Graham Hill {'1': ", '2': ", '3': ", '4': "} (15 February 1929 – 29 November 1975) was a British racing driver and team owner from England, who was twice Formula One World Champion. He is the only driver ever to win the Triple Crown of Motorsport—the 24 Hours of Le Mans, Indianapolis 500 and either the Monaco Grand Prix or the Formula One World Drivers' Championship. He also appeared on TV in the 1970s on a variety of non-sporting programmes including panel games. He liked painting in his spare time.

source: John Surtees
text: John Surtees John Surtees, {'1': ", '2': ", '3': ", '4': "} (11 February 1934 – 10 March 2017) was an English Grand Prix motorcycle road racer and Formula One driver. He was a four-time 500cc motorcycle World Champion – winning that title in 1956, 1958, 1959 and 1960 – the Formula One World Champion in 1964, and remains the only person to have won World Championships on both two and four wheels. He founded the Surtees Racing Organisation team that competed as a constructor in Formula One, Formula 2 and Formula 5000 from 1970 to 1978. He was also the ambassador of the Racing Steps Foundation.

source: Richie Ginther
text: Richie Ginther Paul Richard "Richie" Ginther (Granada Hills, California, August 5, 1930 – September 20, 1989 in France) was a racecar driver from the United States. During a varied career, the 1965 Mexican Grand Prix saw Ginther take Honda's first Grand Prix victory, a victory which would also prove to be Ginther's only win in Formula One. Ginther competed in 54 World Championship Formula One Grand Prix races and numerous other non-Championship F1 events.

source: 1963 German Grand Prix
text: 1963 German Grand Prix The 1963 German Grand Prix was a Formula One motor race held at Nürburgring on August 4, 1963. It was race 6 of 10 in both the 1963 World Championship of Drivers and the 1963 International Cup for Formula One Manufacturers. The 15-lap race was won by Ferrari driver John Surtees after he started from second position. Jim Clark finished second for the Lotus team and BRM driver Richie Ginther came in third.

source: Formula One World Champions
text: Formula One World Champions A Formula One World Champion is a racing driver or automobile constructor which has been designated such a title by the governing body of Formula One - the FIA. Every Formula One World Champion since the inaugural World Drivers' Championship in 1950 and the inaugural World Constructors' Championship in 1958 has been awarded the title by accumulating the required points during the course of the F1 season of that particular year, by participating in relevant Grands Prix.

source: 1965 Mexican Grand Prix
text: 1965 Mexican Grand Prix The 1965 Mexican Grand Prix was a Formula One motor race held at Ciudad Deportiva Magdalena Mixhuca in Mexico City on October 24, 1965. It was race 10 of 10 in both the 1965 World Championship of Drivers and the 1965 International Cup for Formula One Manufacturers. The race was won by Richie Ginther, who took his first victory and the first for the Honda team, after leading for the entire race. The Brabham-Climax of Dan Gurney finished the race second and the Lotus-Climax of Mike Spence completed the podium.

source: 1964 Austrian Grand Prix
text: 1964 Austrian Grand Prix The 1964 Austrian Grand Prix was a Formula One World Championship motor race held at Zeltweg Airfield on August 23, 1964. It was race 7 of 10 in both the 1964 World Championship of Drivers and the 1964 International Cup for Formula One Manufacturers. The 105-lap race was won by Ferrari driver Lorenzo Bandini after he started from seventh position. Richie Ginther finished second for the BRM team and Brabham driver Bob Anderson came in third. This was the debut World Championship race of the future world champion Jochen Rindt.

source: 2006 FIA Formula One World Championship
text: 2006 FIA Formula One World Championship The 2006 FIA Formula One World Championship was the 60th season of FIA Formula One motor racing. It featured the 2006 FIA Formula One World Championship which began on 12 March and ended on 22 October after eighteen races. The Drivers' Championship was won by Fernando Alonso of Renault F1 for the second year in a row, with Alonso becoming the youngest ever double world champion at the time. Then-retiring multiple world champion Michael Schumacher of Scuderia Ferrari finished runner-up, 13 points behind. The Constructors' Championship was won by Mild Seven Renault F1 Team, which defeated Scuderia Ferrari Marlboro by five points.

source: 1963 United States Grand Prix
text: 1963 United States Grand Prix The 1963 United States Grand Prix was a Formula One motor race held on October 6, 1963, at the Watkins Glen Grand Prix Race Course in Watkins Glen, New York. It was race 8 of 10 in both the 1963 World Championship of Drivers and the 1963 International Cup for Formula One Manufacturers. The 110-lap race was won by BRM driver Graham Hill after he started from pole position. His teammate Richie Ginther finished second and Lotus driver Jim Clark came in third.

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Answer: Graham Hill