Dennis McKenna is an ethnopharmacologist, author, and brother to well-known psychedelics proponent Terence McKenna. Joshua Wickerham is the chief advisor to the ESC, Ethnobotanical Stewardsh... Read allDennis McKenna is an ethnopharmacologist, author, and brother to well-known psychedelics proponent Terence McKenna. Joshua Wickerham is the chief advisor to the ESC, Ethnobotanical Stewardship Council.Dennis McKenna is an ethnopharmacologist, author, and brother to well-known psychedelics proponent Terence McKenna. Joshua Wickerham is the chief advisor to the ESC, Ethnobotanical Stewardship Council.