[3] El-Hage has worked as a professor of constitutional law at UPSA,[4] and has lectured on international law issues in the US and other places in Latin America, including at Harvard Law School, the American Enterprise Institute, the Hudson Institute, the Global Centre for the Responsibility to Protect,[citation needed] Brazil's Fundação Armando Alvares Penteado[3] and Argentina's University of CEMA.
[5] El-Hage's opinions in English have appeared in journals in the US and the UK, including in the Americas Quarterly,[6] Forbes magazine,[7] The Wall Street Journal,[8] the National Journal,[9] Wired,[10] and the Washington Post [11] El-Hage is also the author of the book International Law Limitations for the Constituent Assembly: Democracy, Human Rights, Foreign Investment and Drug Control.
[12] The book was presented as part of a package with relevant legal literature to all members of the Bolivian Constituent Assembly (BCA) 2007–2008.
[13] In 2011, El-Hage authored HRF's amicus curiae brief that was filed with the Inter-American Court of Human Rights, on the case of Leopoldo López Mendoza v. Bolivarian Republic of Venezuela.
[14] In 2011 and 2012, El-Hage participated as a judge at the Inter-American Human Rights Moot Court Competition,[15] organized since 1996 by American University's Washington College of Law.