After completing his studies he initially worked as a youth education officer at the . Afterwards, he worked from 1962 to 1965 as a research assistant and "first pedagogue" in the '''' (protestant youth work) at . The theory of emancipatory
youth work, which he played a decisive role in developing, made him known nationwide. The following year he was assistant to
Klaus Mollenhauer at the . Afterwards, he became head of the Department for Social Pedagogy and Adult Education at the Berlin and from 1967 to 1974 departmental director there. In 1975, he received his
doctorate in Hanover with the dissertation
Parents learn sexual education, which also appeared as a book and reached a total circulation of 30,000 copies by the 1990s. In 1976, he was appointed as a university lecturer for the training of vocational school teachers for special education at the University of Hanover, where he taught until his
retirement in 1996. Kentler was one of the advocates of "emancipatory" youth work and is considered a representative of
sexual education of the 1960s and 1970s. In his work as a court expert and expert on child and adolescent sexuality, he achieved recognition in professional circles. From 1979 to 1982 he was president of the
German Society for Social-Scientific Sexuality Research; later he was on the advisory board of the
Humanist Union. He was also a member of the . For Helmut Kentler, theory and practice were tightly knit throughout his life. His development of a theory of emancipatory youth work grew out of his work with adolescents and young adults during his studies and the five years he spent working in church educational institutions. He implemented group pedagogy and teamwork in theory and practice as a trusting and respectful cooperation of pedagogues with different professional competencies, and attempted to gain insight into psychosocial connections for learning and emancipation processes for young people and adults. This was a new concept for church educational work in the 1960s. In addition to his professional duties, he worked in various fields of pedagogical practice in an advisory and teaching capacity. From 1970 to 1974, he sat on the pedagogical advisory board of the first residential community for orphaned children at Maxdorfer Steig, sponsored by the Berlin Senate. During the
student riots in Berlin, Kentler was temporarily active as a "psychological consultant for police issues". The sexual liberation movement of Berlin students in communes and shared flats resulted in his advocacy for emancipatory sexual education in the home. This was reflected scientifically in his dissertation in 1975, rendering him an expert in
sexual education for the course of his professional life. In a model experiment at the end of the 1960s, Kentler placed several neglected 13 to 15-year-old boys he considered "secondary mental defectives" with pedophiles he knew, claiming this would reintegrate them into society and allow them to grow into mature adults. Due to the criminal offense associated with it, he made this public only after its
statute of limitations had expired more than a decade later. Kentler claimed that the experiment would help the children to regain social stability through exposure to pedophiles. He was aware that the adults would most likely perform sexual acts on the minors. The scandal was publicly debated in 2015 and the Senate Youth Administration commissioned the political scientist of the
University of Göttingen to investigate the incident and forward her findings to the relevant authorities. Kentler eventually changed his mind on pedophiles having sexual contact with children, and described pedophilia as a "sexual disorder". In an expert opinion for the
Senatsverwaltung für Familie, Frauen und Jugend he described the results of the 1988 trial as "a complete success". Kentler was single and had three
adoptive sons == Positions ==