Roberto Mangabeira Unger is a Brazilian contemporary social theorist, politician, and law professor at Harvard Law School.
He is the Harvard Law School's only South American faculty member. He was associated with the Critical Legal Studies movement for a brief period in the late 1970s and early 1980s, although Unger has set forth his own criticisms of some of the central ideas that emerged out of this movement, in particular the indeterminacy debate in legal theory, which Unger calls the "radicalization of indeterminacy" in his own writings. He also taught Barack Obama while in Harvard.
Unger has long been active in Brazilian and South American politics, as a candidate, political activist, and as an advisor to world leaders. From 2007 to 2009, he took leave from his position at Harvard to serve in the Brazilian government as Minister of Strategic Affairs.