J. J. Thomson in his office at the Cavendish Laboratory. A colleague of Thomson's, Lord Rayleigh, said that "J.J. had something to say on nearly any subject that might turn up. He was a good raconteur, but also a good listener, and knew how to draw out even shy members of the company.... J.J., while talking, paced the room vigorously in a manner rather suggestive of a caged lion."

Argonne National Laboratory, courtesy AIP Emilio Segrè Visual Archives

1997- American Institute of Physics