She specialises in the history of women philosophers as well as philosophy of economics and computer science and is a specialist on Émilie Du Châtelet.

She invented the Libori Summer School and is the creator of the Encyclopedia of Concise Concepts by Women Philosophers, for which she holds the position of editor in chief together with Mary Ellen Waithe.

She was also a member of the Advisory Board of the Munich Center for Technology in Society (MCTS) at the Technische Universität München (2011-2019).

In 2019, Hagengruber became vice president of the Deutsche Akademikerinnenbund DAB and was elected member of the Leibniz Sozietät der Wissenschaften zu Berlin.

In this capacity, she awards the Elisabeth of Bohemia Prize for the recognition of women in the history of philosophy since 2018 [7] and published the first digital and historical-critical edition of Émilie du Châtelets St Petersburg Manuscripts.