Dr. Eef Theunissen started her PhD in 2001 at the Faculty of Psychology of the University of Maastricht, under Prof. Ramaekers and Prof. Riedel's supervision. In 2005 she obtained her PhD in psychopharmacology on the sedating and stimulating effects of antihistamines. Her Ph.D. research included studies into the sedating effects of antihistamines on driving and cognitive performance. From 2005 until 2007, she worked as a post-doc at the University of Maastricht. In this period, she studied the effects of a high dose of cannabis on cognitive performance in occasional and daily cannabis users, using Event-Related Potentials. Since 2007, Eef works as an assistant professor at the Faculty of Psychology of the University of Maastricht and has been involved in several studies determining the effects of medicinal drugs and drugs of abuse on driving performance, cognition and subjective experiences. She has co-supervised many Ph.D. students within the experimental psychopharmacology unit, working e.g. on projects with psychedelics and novel psychoactive substances. Recently, she finished a series of first-in-man studies with a synthetic cannabinoid detected in herbal smoking mixtures such as Spice.