[2] In 1963 he studied psychoanalysis with Roberto Assagioli, the founder of psychosynthesis, and began to dedicate himself to psychiatry trying to solve the problems of the patients and avoiding hospitalisation and any kind of coercive method (mechanical, pharmacological, psychological).

At the time of his death in 2017 Antonucci lived in Florence and collaborated with the Italian branch of the Citizens Commission on Human Rights, with the Centro di Relazioni Umane[6] and with Radicali Italiani.

Szasz affirmed to agree with Antonucci on the concept of "person" of the so-called psychiatric patients: "They are, like us, persons in all respects, that can be judged emotionally and in their "human condition"; "mental illness" does not make the patient "less than a man", and it is not necessary to appeal to a psychiatrist to "give them back humanity""[9].

He is the founder of the non-psychiatric approach[1][10][11] to psychological suffering, that is based on the following propositions: Antonucci posited that the "essence of psychiatry lies in an ideology of discrimination".

[12] He defended a “non-psychiatric thought, which considers psychiatry as an ideology without scientific content, a non-knowledge, whose aim is to annihilate people instead of trying to understand the difficulties of life, both individual and social, in order to defend people, change society and give life to an authentically new culture.”[13] In the words of Thomas Szasz, "Italian psychiatry has been incalculably enriched by Giorgio Antonucci.