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Guillaume is a senior research fellow at CEPR. He has held several cabinet positions in the government of Ecuador, including Minister of Foreign Affairs, Minister of Culture, and Minister of Knowledge and Human Talent. Most recently, he served as Ecuador’s Permanent Representative to the United Nations in Geneva.

Guillaume has trained as a historian and holds a PhD in international politics from the University of London. His research focuses primarily on the foreign policy of Latin American states, regionalism and integration in Latin America (including the workings of the OAS, MERCOSUR, UNASUR, CELAC, and other regional bodies), Ecuadorian domestic politics, and the Colombian conflict and peace process. At the multilateral level, he has led initiatives on tax havens, bilateral investment treaties, and a UN treaty on human rights and transnational corporations. Guillaume is fluent in English, Spanish, and French.


All from Guillaume Long

US Sanctions and the Sharp Rise in Infant Mortality in Cuba

US Sanctions and the Sharp Rise in Infant Mortality in Cuba

Cuba’s infant mortality rate has risen by 148 percent since 2018, indicating a severe deterioration in population’s overall health. The unparalleled hardening of US sanctions during the first Trump administration, largely maintained under the Biden administration and further expanded in a second Trump term, including a devastating fuel blockade, is the primary cause of the current economic and humanitarian crisis—widely considered the worst in the island’s contemporary history.

Nurses care for newborns in a Cuban hospital maternity ward. (Photo by robert wallis/Corbis via Getty Images)
(Project Syndicate) Ecuador’s Warning to Trump

(Project Syndicate) Ecuador’s Warning to Trump

By rejecting all four ballot measures in a recent referendum, Ecuadorian voters demonstrated an understanding that neither their right-wing president, Daniel Noboa, nor Donald Trump seems to share. Militarizing poor neighborhoods and inviting US troops is no way to resolve a security crisis.

By Guillaume Long

A woman casts her vote during the referendum, in Manglaralto, Santa Elena province, Ecuador on November 16, 2025. Ecuadoreans are voting in a referendum proposed by President Daniel Noboa on whether to allow the return of foreign military bases, draft a new constitution that could expand presidential powers, eliminate public funding for political parties, and reduce the number of lawmakers. (Photo by MARCOS PIN / AFP) (Photo by MARCOS PIN/AFP via Getty Images)