Rosh was the first female journalist to manage a public broadcasting service in Germany and in the 1970s the first anchorwoman of Kennzeichen D [de], a major political television program.

[1] Motivated by historian Eberhard Jäckel, she was one of the primary forces who lobbied from 1988 onwards for over 17 years for the construction of the widely controversial[3] Memorial to the Murdered Jews of Europe, completed in May 2005.

She has been chairman of the Förderkreis zur Errichtung eines Denkmals für die ermordeten Juden Europas (Society for the Promotion of Raising a Monument to the Murdered Jews of Europe) since 1995, and vice chairman of the board of trustees of the Stiftung Denkmal für die ermordeten Juden Europas (Foundation for the Memorial to the Murdered Jews of Europe) since 1999.

Since 2007 Lea Rosh has held a post as a lecturer at the University of Management and Communication (FH) [de] Potsdam in the fields of Moderating and Media training.

[1] Michael Naumann first had opted against the Berlin Holocaust Monument and (similar to the less known Eike Geisel) had interpreted the attempts as a self finding process of the German bourgeoisie and a "hidden conclusion" (heimlicher Schlußstrich) of the Vergangenheitsbewältigung.

When at the Holocaust monument's dedication on 10 May 2005, Rosh held up a molar tooth which she had retrieved from Belzec concentration camp in 1988, promising to place it in a column at the memorial,[9] the act outraged several prominent German Jewish leaders, notably Paul Spiegel, the then chairman of the Central Council of Jews in Germany, who described the idea as "irreverent".