The daughter of Ekkehard and Friedel Technau, she was born in Königsberg and studied pharmacy and art. She wrote children's books, novels, poetry and radio plays before writing her first play for the theatre Doppelkopf in 1967. Her plays Himmel und Erde (Heaven and Earth) (1974) and Sonntagskinder (Sunday's children) (1976) were also produced as films. Most of her plays were directed by the influential director Claus Peymann.
She received a Schiller Memorial Prize in 1974, the Mülheimer Dramatikerpreis in 1977, the Andreas Gryphius Prize in 1982, the Roswitha Prize in 1988, the Ludwig Mülheims Preis in 1993 and the Niedersächsischer Staatspreis in 1999.
- Leben und Tod der Marilyn Monroe (Life and death of Marilyn Monroe), play (1971)
- Eisenherz, play (1982)
- Die flüchtige Braut, novel (1993)
- Die Clownin, play (1985)
- Jäger am Rand der Nacht, novel (1993)
- "Gerlind Reinshagen ist tot / Autorin starb mit 93". www.boersenblatt.net (in German). Retrieved 2019-06-11.
- Sleeman, Elizabeth (2001). The International Who's Who of Women 2002. p. 473. ISBN 1857431227.
- Furness, Raymond; Humble, Malcolm (2003). A Companion to Twentieth-Century German Literature. pp. 243–44. ISBN 1134747640.
- Eigler, Friederike Ursula; Kord, Susanne (1997). The Feminist Encyclopedia of German Literature. pp. 442–44. ISBN 0313293139.
- Sieg, Katrin (1994). Exiles, Eccentrics, Activists: Women in Contemporary German Theater. University of Michigan Press. pp. 121–. ISBN 0472104918.