Before joining the ADB, Antonio was a Lead Specialist in Telecommunications for the Institutions for Development and also led the broadband initiative at the Inter-American Development Bank. Antonio has extensive experience in the telecom sector, having held various positions of responsibility. At Deloitte Spain, he led the regulation and strategy practice for Latin America and the Caribbean. Prior to that, he was the Chief Economist at Telefónica's Cabinet for Economic Studies of Regulation in Spain. Before joining Telefónica, Antonio served as Deputy Director of Economic Analysis and Markets at the Spanish Telecom Regulator (CMT).

Throughout his career, Antonio has provided advisory services to regulators, telecom operators, and governments in countries such as Saudi Arabia, China, Ecuador, Argentina, the Dominican Republic, Paraguay, Poland, and the Czech Republic, among others. Antonio also serves as a member and expert on several committees, including the World Economic Forum and the International Telecommunication Union. He holds a PhD in Economics from the University Carlos III of Madrid and has been an associate professor of applied finance for telecommunications at the Instituto de Empresa Business School, as well as a professor of economic regulation at American University and Johns Hopkins University. He is the author of numerous publications on economic and regulatory aspects of the telecommunications sector.