Gary Barker pioneered ground-breaking work with young people, in particular disaffected young men, to promote gender equality and prevent violence. Instituto Promundo in Brazil, which he co-founded in 1997, has brought about remarkable changes in young people’s attitudes through workshops, social media, music, videos and toolkits. Promundo’s ideas are now being used all over the world. He is interviewed by Nikki van der Gaag.

How did it all start?