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Stier has been working intensively on the specific health problems of male adolescents for a long time. Brochures meet the needs of male teenagers to be able to anonymously acquire knowledge on "such topics".<ref name=Zieriacks/> Together with his daughter he has also published a book about [[puberty ]] (see below).<ref>{{REFnews
|url=https://www.wetterauer-zeitung.de/wetterau/butzbach-ort848698/pubertaet-geht-auch-vorbei-11987084.html
|title=Die Pubertät geht auch vorbei…