While in New York, Ropac became acquainted with young American artists such as Andy Warhol, Jean-Michel Basquiat, Keith Haring and Robert Mapplethorpe, which he started to exhibit as one of the first gallerists doing so in Central Europe.
Here he renovated a 1900 former heating systems factory in Pantin,[1] in the east of Paris, and transformed its eight buildings to make exhibition halls, a performance centre, a library/archive, a viewing room and artists' studios.
The gallery organizes extensive solo and group exhibitions, often accompanied by comprehensive publications, not only in its own premises, but also in collaboration with major international museums and other non-commercial art institutions.
In May 2008, the Österreichische Galerie Belvedere in Vienna received 17 works of art[5] by Julius Deutschbauer, Walter Obholzer, Gerwald Rockenschaub, Hubert Scheibl and Erwin Wurm, among others, from Ropac's personal collection.
In November 2006, he received the gold cross from the Austrian Republic (Verleihung goldenes Verdienstkreuz der Republik Österreich an Thaddaeus Ropac im Bundeskanzleramt).