<P> The longest - serving and most successful person to manage Manchester United is Sir Alex Ferguson , who won 13 Premier League titles , five FA Cups , four League Cups , 10 Community Shields , two UEFA Champions League titles , one UEFA Cup Winners ' Cup , one UEFA Super Cup , one Intercontinental Cup and one FIFA Club World Cup in his managerial reign of more than 26 years . </P>
who is the longest serving manager in manchester united history
Sir Alex Ferguson