[1][2][3][4][5] Following his mentor, Feldmár practices and popularizes a form of radical psychotherapy, where the main goal of the therapist is to engage in a real, spontaneous and honest relationship with the patient.

[6][7] This approach is based on the findings of research on interpersonal phenomenology, spiritual emergency, the anthropology of healing, existential psychotherapy and community therapy.

Feldmár rejects the labelling of human suffering, and therefore distances himself from the mainstream forms of psychiatry and psychotherapy which are based on the concept of mental illness.

[8][9][10][11] He has published many books in Hungarian, and he lectures, teaches, and provides supervision and therapy internationally, he has worked as a psychotherapist with over 52 years of experience, having spent more than 100,000 hours in psychotherapy with clients.

[28][29] During this year he also studied from a wide range of well-known experts of their fields: Francis Huxley, John Heaton, Hugh Crawford and Leon Redler.

He gained further experience in the field while volunteering at Hollywood Hospital in New Westminster, where LSD was legally used for research and therapy.

He has participated in many research projects and taught, lectured and lead workshops at the Simon Fraser University (SFU),[35] University of British Columbia (UBC),[36] Emily Carr and Douglas College,[37] The Cold Mountain Institute,[38] The Collingwood Institute and meetings of BC Psychologists Association as well as in Europe (e.g. London[39] and Stuttgart[40][41]).

In Hungary he is a frequent participant of popular open lectures and podiums,[42] he has a regular column with Dorottya Büky in the Hungarian newspaper HVG.

[46] In 2007, he appeared in an episode of the Colbert Report,[47] after he was banned from the US for several years as the result of a border guard googling his work.

)[52] The Institute is also involved in the sponsorship and professional work of the Soteria Shelter program in Budapest, a non-coercive alternative to psychiatric hospitalization.

In the mid 60's he was the Poet of the Month on Toronto's CHQM radio, and his poetry was read at the Vancouver Art Gallery.

Two full-length portrait films have been made about him in Hungary: Bence Fliegauf's 2002 documentary Van élet a halál előtt?