Felix Guattari (April 30, 1930 - August 29, 1992) was a French philosopher, social theorist, and psychoanalyst. His work was deeply influenced by Marxism, psychoanalysis, and post-structuralism, and he proposed concepts such as 'anti-psychiatry' and 'social relations network'. Guattari's ideas have had a profound impact on contemporary cultural, political, and philosophical fields.