Arsene Wenger joined Arsenal in 1996 as a relative unknown to those outside of French football.
He changed the culture of not just his own club but most of the Premier League with his attitude towards diet, fitness and preparation.
More than just a moderniser, for Gunners fans Wenger has delivered trophies and sparkling football, as well as some of their greatest memories of the club.
As he celebrates 20 years in charge at Arsenal, Sportsmail takes a look at the Frenchman's 20 greatest moments.
20 - 'Arsene who?