Hans-Werner Gessmann (24 March 1950 – 3 October 2023) was a German psychologist, founder of humanistic psychodrama, and a university teacher in Russia, India, and Africa.

[3] In the last twenty years, he concentrated on the diagnosis and therapy of transgender people and has been recognized as a court expert in Germany.

[12] He was the only author in the German-speaking area to address this topic, including translations of the complete source texts from English.

From 1998 to 2002, under his guidance, the tongue muscle training with the registered trademark ZMT ® was developed as an alternative treatment against sleep apnea.

[20] Intuitive look for detecting the wholeness of a thing, the dialectical conception of polarities, the renunciation of absolute authority, take influence on the image and life of man.

[citation needed] After the introduction of the test for medical study courses in 1986, this was reconstructed for training in the original by Gessmann several times.

[24] From February 2012 onward, he was a professor of systemic family therapy and humanistic psychodrama at the Moscow State University of Psychology and Education (МГППУ)].

[22] Working as a longterm visiting professor for Clinical psychology and psychotherapy since March 2020 at the State Krasnoyarsk Medical University Prof. V.F.

In June 2021, he was appointed as head of the department of psychology at DMI - St. John the Baptist University in Malawi / Central Africa.

Gessmann delivered lectures on humanistic psychodrama as group-psychotherapy and offered presentations on psychosomatics with his scientific assistant Vishal Lohchab during the months of August and September 2023 at the CHRIST (Deemed to be University) in New Delhi and Bangalore.