Dr. Dennis McKenna is an ethnopharmacologist, author and founder of Symbio Life Sciences. He has dedicated his career to the study of hallucinogens and psychedelics and is a founding board member of the Heffter Research Institute, a non-profit organisation dedicated to investigating therapeutic uses of psychedelic medicines. He has conducted extensive ethnobotanical fieldwork in the Peruvian, Colombian, and Brazilian Amazon and has recently completed a four year project investigating Amazonian ethnomedicines as potential treatments for cognitive disorders in schizophrenia. Dennis and his late brother Terrance McKenna are considered pioneers among plant medicine scholars.