Ph.D.

Hashini Perera, Ph.D. student and lead author of the study from the Advanced Technology Institute at the University of Surrey, said:

He did have academic bona fides: a Ph.D. from Yale and experience in university administration, running the tiny Midland University in Nebraska.

"People are increasingly enjoying recreating in nature, which is fantastic," said lead author Ellie Bolas, a Ph.D. candidate in the UC Davis Department of Wildlife, Fish and Conservation Biology.

Ruth Bettelheim, Ph.D., is a life coach and a child, marriage, and family psychotherapist whose writing has appeared in The New York Times, Psychology Today, The Huffington Post, USA Today, and other publications.

Jackson Katz, Ph.D., is an educator, author, and scholar-activist who has long been a major figure in the growing global movement of men working to promote gender equity and prevent gender-based violence.