Alex Ferguson reaches 25 years in charge of Manchester United on Sunday, embarking upon his second quarter century with the same vigor that he began the first. Ferguson's 27 major titles with United make him the most successful manager in British football history but it is his ability to adapt and willingness to change his approach to the game that make him truly remarkable. The 69-year-old Ferguson's seemingly contradictory combination of iron will and tactical flexibility has led United great Bobby Charlton to call him “a genius.” Already the longest serving manager in United history, Ferguson reaches the landmark the day after his side hosts Sunderland in the Premier League in his 1,409th match in charge. Ferguson arrived at Old Trafford in November 1986. The Scottish manager has brought United an unmatched list of modern honors including 12 Premier League titles, two Champions League trophies, five FA Cups and a FIFA Club World Cup.