The GEO Collaboration comprises 19 European research institutions.
The GEO Collaboration and its members are part of the LIGO Scientific Collaboration. A full list of the about 260 members of the GEO Collaboration is available in the LIGO Roster. They are based at the following institutions:
Leibniz University, Hannover
Queen Mary University of London
Royal Holloway, University of London
Rutherford Appleton Laboratory