Harvard grad Anand Mahindra took over last year as chairman of the $16.2 billion (revenues) Mahindra & Mahindra conglomerate cofounded by his grandfather in 1945. Shares of company fell amid slump in auto sales, both domestic and exports. In recent years, he has spearheaded a series of acquisitions, including that of South Korea's Ssangyong Motors, electric carmaker Reva and even scandal-ridden Satyam Computer Services (since renamed Tech Mahindra). He also has a small stake in Kotak Mahindra Bank. Mahindra tweets regularly on business, cinema, American politics and has 1 million followers.