Friends and colleagues have paid tribute to Professor Ross Anderson, professor of Security Engineering at Cambridge University and Edinburgh University and a fearsome campaigner for digital rights. Professor Anderson, who died unexpectedly at his home in Cambridge on Thursday 28 March 2024 aged 67, is known equally for his monumental work in the field of security engineering and his relentless campaigning for privacy and security. A fellow of the Royal Society and recipient of the BCS Lovelace medal for his contributions to developing security engineering as a discipline. His text book, Security Engineering, is described by fellow security specialists as his masterwork. “He was enthusiastic, brilliant, opinionated, curmudgeonly, and kind,” wrote Bruce Schnier, who has known Ross for over thirty years. From the High School in Glasgow, Ross Anderson went on to read Mathematics at Trinity College Cambridge, and completed his doctorate in 1995 under the supervision of Roger Needham, a world leading researcher in security and computer architecture.