He has taught fiction writing in the USC English Department, and guest lectured for UCLA, and for Harvard in the United States and around the world.

His hobbies include esoteric audio, travel, working on science-fiction convention committees, and guest lecturing on SF to institutions such as the Smithsonian.

He has preached in countries around the world, and guest lectured at theological seminaries and schools.

He has appeared in several documentaries, and guest lectured at universities, libraries and conferences across the country.

I only guest lectured there.

From 1971 to 1977, he served as Minnesota's Commissioner of Agriculture, and guest lectured.

Additionally, she taught privately and guest lectured at the University of Southern California in the School of Theatre.

He guest lectured at Harvard University and at the University of Uppsala, Sweden, where from 1978 to 1981 he had been Professor of History of Religion.

Denny occasionally taught young guitarists, both privately and as a peripatetic teacher at London comprehensive schools, and guest lectured at the Royal College of Music on the life of a session musician.

In spring 1967 he guest lectured at New York University, Princeton, Harvard and Columbia.