The NAGT is regarded as the leading professional organization for those interested in and committed to the teaching of earth science. Its membership of over 2,000 includes representatives from all levels of education.

A Hamilton faculty member since 1978, Tewksbury is currently chairing the geology department. She has introduced innovative methods of improving geoscience teaching at both high school and undergraduate levels. Two years ago she received a National Science Foundation grant to design a pioneering introductory course on the Geology and Development of Modern Africa. The highly successful course includes rigorous studies of geology and geologic processes, and their underlying effects on relevant human issues.

Tewksbury is a former president of the geology division of the Council on Undergraduate Research, and has also helped promote effective teaching and curricular reform through NAGT sponsored workshops and its Distinguished Speakers program. She will serve as president of the Association during 1997.