Joan Parés Grahit is a medical practitioner. He was born in Barcelona and retired in 2010. In 1974, he graduated in Medicine from the Autonomous University of Barcelona and in 1978, he was certified as a specialist in the respiratory system by the same university.
In the area of medicinal cannabis, he has worked since 2008 in therapeutic attention to members of the La Maca Cannabis Club of Barcelona. From 2010 to 2015 he was a volunteer doctor in the Therapeutic Service Team of CatFAC (the Federation of Cannabis Associations of Catalonia). In October 2015, he became a founding member of the Spanish Observatory of Medicinal Cannabis. In recent years, he has given talks and lectures to associations interested in the recreational and medicinal use of cannabis.