This is the biography of one of the most original and widely significant, yet largely forgotten, British scientists. Frederick Soddy was one of the first generation of English atomic scientists, working with Rutherford on the initial discoveries about atomic disintegration, and received the Nobel Prize in 1921 for his research on isotopes. Soddy's worry about the responsibility of science and scientists to society began with his fear that the atomic energy he and Rutherford had discovered could be disastrous if suitable political controls were not enforced, and led to his abandoning scientific research. He lived to see his worst fears realized with the bombing of Hiroshima and Nagasaki. Soddy was a pioneer in the field of energy conservation and environmental ethics, a remarkable and talented man who was not recognized as such in his own lifetime, largely because his ideas and attitudes did not fit in with the times in which he lived. Since his death, he has received rightful recognition, not only for his scientific work, but also because increased awareness of the environment and science's role in it is akin to his own philosophies. Historians in science, economics, and politics will find this a fascinating read of one of the first proponents of scientific responsibility.