Kathleen Hylda Valerie Booth died at age 100, closing a century-spanning career at the foundations of computer science.
Kathleen Hylda Valerie Booth died on September 29, 2022, at the age of 100, having lived long enough to see computing evolve from room-sized electromechanical relay machines she helped design in the 1940s into the ubiquitous digital technology of the twenty-first century.
Over her long career, Booth co-designed some of the earliest operational computers in the world (the ARC, SEC, and APE(X)C at Birkbeck College), invented what is widely regarded as the first assembly language, co-developed the influential Booth multiplier algorithm still used in processor design, conducted pioneering work in machine translation, and co-founded what is considered the world's first university computer science department. She remained intellectually engaged well into old age, co-authoring a paper on neural networks with her son when she was around 70 years old.
Her death prompted renewed public recognition of her foundational, but historically under-credited, contributions to computer science. Tributes from computing historians, archives, and institutions such as Birkbeck, University of London, highlighted her as one of the pioneering women whose technical achievements had been overshadowed for decades by more famous male contemporaries.
Kathleen Booth's death marked the passing of one of the last living direct pioneers of the earliest generation of electronic computing, and renewed interest in her life has helped secure her place in the historical record as the creator of assembly language and a founder of computer science as an academic discipline.