A senior researcher at the Instituto Nacional de Psiquiatria (Mexico) and professor in programs at the Universidad Nacional Autonoma de Mexico (UNAM), he has mentored 41 students and published 363 articles and book chapters. His areas of expertise are alcohol and drugs and how they related to injuries and suicide, psychiatric nosology and the role of immigration on mental health. Guilherme served as a member of the DSM-5 and is a member of WHO Reference Group on Alcohol and Drug use Epidemiology. He has received several awards, including the “Jellinek Memorial Fund Award” (epidemiology, 2015).