Rotund, bespectacled, and with an encyclopedic mind that has earned him the nickname "the Professor," Amir Khustuldinov is about as far as you can get from the stereotypical image of a football lout.
Yet Khustuldinov, 50, a native of Moscow and lifelong supporter of the city's Spartak football club, is also probably one of the most respected figures in the secretive and violent world of Russian football hooliganism.
"I started in 1977 when I was 12 and my dad started taking me to Spartak matches," he said at Spartak's north Moscow training ground. "I only quit because it's not very seemly for an old bloke like me to be fighting alongside youngsters and doing it better than them," he laughed.
A ruthless police crackdown in recent years has made terrace violence of the kind seen in France during Euro 2016 a rarity in Russia. Nonetheless, hooliganism in Russia remains a thriving underground scene.
"Football hooligans are ordinary people who love violence. And we are the most honest part of society. We don't deny that people aren't angels - we recognise that. We have business people, clerks, rightists, leftists, everyone. When your mates are at your back, and the other side is coming at you, and it's 'let's go!' - the world is in your hands. Neither sex, nor any drug, comes anywhere close to the adrenalin pouring through you after a fight."