Brendan O'Leary (1958-) ... formerly a professor of Political Science, London School of Economics
This article says:
The breakdown in talks in Northern Ireland has raised the possibility of direct rule from London, by a Conservative government propped up by Democratic Unionist Party MPs. According to Brendan O’Leary, professor of political science at the University of Pennsylvania and one of the architects of the agreement, that would violate the Good Friday deal and even prompt the EU to think twice about signing a Brexit pact with the U.K.
See this Wikipedia (English) article