Pierre-Félix Guattari (; French: [gwata?i] (listen) ; April 30, 1930 – August 29, 1992) was a French psychotherapist, philosopher, semiologist, and activist.
He founded both schizoanalysis and ecosophy, and is best known for his intellectual collaborations with Gilles Deleuze, most notably Anti-Oedipus (1972) and A Thousand Plateaus (1980), the two volumes of Capitalism and Schizophrenia.