Michael Schumacher holds the record for the most Formula 1 World Drivers' Championships with 7 titles (1994, 1995, 2000, 2001, 2002, 2003, 2004). Lewis Hamilton has since equaled this record, but at the time this question was likely written, Schumacher was the clear leader. Senna won 3 championships, Alonso has won 2, and Moss never won a title.