Mr. Fanjul holds a PhD in Economics, having been a Visiting Scholar at the Departments of Economics at both Harvard University and at MIT.

He is the Founding Chairman and former CEO of Repsol. He has also served as Chairman of Hidroeléctrica del Cantábrico, NHH, and Deoleo. Currently, he is a board member of The Marsh & McLennan Companies and Ferrovial. In 2024, he was appointed President of Cellnex. Additionally, he has held roles such as Vice Chairman of Lafarge, Vice Chairman of Omega Capital, and Vice Chairman of Holcim, as well as being a board member of Unilever, BBVA, the London Stock Exchange, Areva, and Acerinox.

He is Vice Chairman of the Board of Trustees of the Museo Nacional Centro de Arte Reina Sofía, and a trustee of the Instituto de Estudios Superiores de Empresa (IESE), of the Centro de Estudios Monetarios y Financieros (Bank of Spain) and of the Aspen Institute (Spain). He has also been a Trustee of the International Financial Reporting Standards Committee.