In 1969, Jon Beckwith and his colleagues succeeded in isolating a gene from the chromosome of a living organism. Announcing this startling achievement at a press conference, Beckwith took the opportunity to issue a public warning about the dangers of genetic engineering. Jon Beckwith's book, the story of a scientific life on the front line, traces one remarkable man's dual commitment to scientific research and social responsibility over the course of a career spanning most of the postwar history of genetics and molecular biology.