In 1977 – Diploma in international human rights, René Cassin Institute, University of Strasbourg, France.
In 1980 – B.C.L., National University of Ireland, University College Dublin.
In 1983 – Dip.Eur.L., National University of Ireland, University College Dublin.
In 1987 – B.A., University of Dublin, Trinity College.
In 1987 – LL.M. First Class Honours, National University of Ireland, University College Dublin.
In 1989 – LL.M., Columbia University School of Law.
From 1989 to 1994 – Associate, Litigation Department, Paul, Weiss, Rifkind, Wharton & Garrison LLP, New York.
In 1997 – J.S.D., Columbia University School of Law.
From 1994 to 1997 – Assistant Professor, DePaul University College of Law, Chicago.
From 1997 to 2003 – Associate Professor, DePaul University College of Law, Chicago.
From 2003 to 2011 – Professor, DePaul University College of Law, Chicago.
From 2011 to 2017 – Distinguished Research Professor of Law, DePaul University College of Law, Chicago.
From 2017 to present – Full Professor, Faculty of Law, McGill University, Montreal.
Visiting Professor of Law at the University of Oxford, Leiden University and University College Dublin.
From 2017 to present – Director of the Institute of Air and Space Law at the McGill University, Montreal.