William L. Fash summers in Copan, Honduras.

His resort hotel is the Harvard Field School and his travel companions are 12 students who accompany him as part of the summer school course Anthropology S-132: "Field Methods in Maya Archaeology."

Fash is a senior Harvard professor--the Bowditch professor of central American and Mexican archaeology and ethnology.

But he is one of about 120 teachers affiliated with Harvard who will spend their summer vacations teaching students who are mostly not full-time Harvard undergraduates.

"I do my best teaching in the field. It is a wonderful opportunity for students to get their hands dirty and to conduct the craft of excavation," Fash says.

Most professors who teach during the summer are junior faculty, including many lecturers, assistant professors and teaching fellows, according to Peter Buck, dean of the summer school and senior lecturer on the history of science.

But approximately 25 of them are full professors and 10 are senior lecturers or preceptors, he says.

These professors come from all areas of the Faculty of Arts and Sciences (FAS), from humanities, social sciences and natural sciences.