Tom Williams is the AAVSO Historian and has served in AAVSO leadership positions for over 20 years, including twice as president. He earned a Ph.D. in History from Rice University in 2000, after spending over thirty years as an industrial chemist and manufacturing manager. Since then, Dr Williams has served as a senior editor for the Biographical Encyclopedia of Astronomers (Springer, 2007) and has written forty-three entries for that work. Over the past twenty-five years he has published book chapters, encyclopedia entries and over thirty articles and book reviews.