His research interests include Arts and cultural policies and practices; Art and public space; Status of the artist, as well as Modernist aesthetics and criticism; Postmodern art theories and practices; and Ontology of art. He teaches various art relaed courses, such as Art Institutions and Cultural Policies, Status of the Artist in Post-Modern Culture, Art Philosophy, and Contemporay Theories of Art. Ratiu was a Senior Fulbright Visiting Scholar at Northeastern University in Boston (2010), an A.W.Mellon Visiting Fellow 2007/2008 at IWM Vienna, and Visiting Professor at de l’École des hautes études en sciences sociales Paris (2004) and Maison des Sciences Paris (2003). He is author of several books and scientific articles, including: