When Roland Ratzenberger crashed brutally during qualifying for the 1994 San Marino Grand Prix, Formula One was forced to face mortality for the first time in eight years, but the death the following day of Ayrton Senna cast a shadow over Ratzenberger’s tragedy. Twenty years on, Ratzenberger’s memory breathes, as does his legacy. Leigh O’Gorman spoke to the drivers who raced against and knew him, as they remember Roland Ratzenberger – Formula One’s forgotten man.