In the 1950s, Chapman progressed through the motor racing formulae, designing and building a series of racing cars, sometimes to the point of maintaining limited production as they were so successful and highly sought after, until he arrived in Formula One. Besides his engineering work, he also piloted a Vanwall F1-car in 1956 but crashed into his teammate Mike Hawthorn during practice for the French Grand Prix at Reims, ending his career as a race driver and focusing him on the technical side. Along with John Cooper, he revolutionised the premier motor sport. Their small, lightweight mid-engined vehicles gave away much in terms of power, but superior handling meant their competing cars often beat the all-conquering front engined Ferraris and Maseratis. Eventually, with driver Jim Clark at the wheel of his race cars, Team Lotus appeared as though they could win whenever they pleased. With Clark driving the Lotus 25, Team Lotus won its first F1 World Championship in 1963. It was Clark, driving a Lotus 38 at the Indianapolis 500 in 1965, who drove the first-ever mid-engined car to victory at the "Brickyard". Clark and Chapman became particularly close and Clark's death in 1968 devastated Chapman, who publicly stated that he had lost his best friend.