Answer
Nolan Ryan is the all-time leader in no-hitters in Major League Baseball, with seven. He threw his first no-hitter on May 15, 1973, against the California Angels, and his last on September 28, 1991, against the Toronto Blue Jays. Ryan is also the only pitcher to throw a no-hitter in both leagues, and he is one of only two pitchers to throw a no-hitter in the postseason.