From 1969 until 1978, she attended the Theodor-Heuss-Gymnasium (now Carl Friedrich von Weizsäcker Gymnasium)[2] secondary school in Ratingen, already writing for the local editorial office of the Rheinische Post before her graduation.
In 1983, shortly after the WDR had started airing its evening program "Current Hour", Kellermann applied there and became regional correspondent for Duisburg and the Lower Rhine.
Kellermann had been out as transgender in her private life for a significant amount of time,[4] including coming out to her father in the mid 1980s.
[7] While visiting the United States in 2019, she finally made the decision to make her gender identity publicly known through changing her profile pictures on social media and discussing it with her colleagues upon returning to Germany.
[9][10] 1999: Radio, TV, and New Media Prize together with Tom Buhrow, Claus Kleber and Sabine Reifenberg for Oh Gott, Amerika!