Besides my teaching and research, I am active in the History of Science Society. For more on the HSS and its work, visit its website. I am also a member of the Society for the History of Technology, the British Society for the History of Science, the British Scholar Society, and the Forum for the History of Physics of the American Physical Society. Locally, I'm active in the University of Texas History and Philosophy of Science Colloquium, which meets at noon most Fridays during the academic year. In 1988 I helped found the Lone Star History of Science Group, which seeks to bring together historians of science, technology, and medicine from across Texas; it has met each spring ever since. The longevity and conviviality of the Lone Star Group is no doubt traceable in part to the fact that it is barred by its constitution from having any officers, by-laws, or dues. Anyone interested in joining the group (that is, in being added to its e-mail list) should contact me at