Carles Viñas is an expert in football and skinhead culture. Exposing racism in the sport, as well as championing its radical history, his passion for the game has led him to write numerous books on the subject, including the award-winning St. Pauli: Another Football is Possible.

Luke Stobart is an academic and writer, as well as a translator and interpreter. He is a lecturer in Spanish history and politics at King's College, London, and economic history at the Universitat Autònoma de Barcelona. He is currently writing a book on contemporary left-wing politics and movements in the Spanish state.