Since 1964 Stith has been a member of the American Association of Physics Teachers (AAPT), where he became of Vice President in 1990, succeeding Thomas D. Rossing. In the subsequent four years he became President Elect, President, and then Past President.
Since 1964, Stith has been a member of the American Association of Physics Teachers (AAPT), holding various leadership positions including Vice President in 1990, succeeding Thomas D. Rossing. He then served as President-Elect, President, and finally Past President over the next four years.