Pierre-Félix Guattari was a renowned French philosopher, psychoanalyst, semiotician, social activist, and screenwriter. He was born on March 30, 1930, and passed away on August 29, 1992.

Guattari is best known for co-founding the field of schizoanalysis with Gilles Deleuze, and for independently creating ecosophy. His most notable works were collaborative efforts with Deleuze, including Anti-Oedipus (1972) and A Thousand Plateaus (1980), the two volumes of their acclaimed theoretical work Capitalism and Schizophrenia.

Throughout his life, Guattari was associated with the influential La Borde clinic, a hub for institutional psychotherapy, and was long involved with the seminars of Jacques Lacan, who was also his psychoanalyst. Though initially influenced by Lacan, Guattari distanced himself from Lacanian theories after his collaboration with Deleuze, notably coining the term "deterritorialization."

As an activist, Guattari supported numerous minority causes amidst the backdrop of globalization, including advocacy for Palestinians in 1976, Italian workerists in 1977, and Brazil's re-democratization process from 1979 onward.