Dennis J. McKenna, Ph.D. has conducted research in ethnopharmacology for over 40 years. He is a founding board member of the Heffter Research Institute, and was a key investigator on the Hoasca Project, the first biomedical investigation of ayahuasca. He is the younger brother of Terence McKenna. From 2000 to 2017, he taught courses on Ethnopharmacology and Plants in Human affairs as an adjunct Assistant Professor in the Center for Spirituality and Healing at the University of Minnesota.