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.
From 1964 onward, Stith has been a member of the American Association of Physics Teachers (AAPT), rising through the ranks to become Vice President in 1990, succeeding Thomas D. Rossing. He subsequently served as President-Elect, then President, and finally Past President over the next four years.