In natural philosophy he is known for "The Singular Universe and the Reality of Time". In social theory he is known for "". In legal theory he was part of the Critical Legal Studies movement, which helped disrupt the methodological consensus in American law schools. His political activity helped the transition to democracy in Brazil in the aftermath of the military regime, and culminated with his appointment as Brazil's Minister of Strategic Affairs in 2007 and again in 2015. His work is seen to offer a vision of humanity and a program to empower individuals and change institutions.