Villamayor is an economist with experience in competition policy and economic regulation. He got his B.A. in Economics from the National University of Mexico and his M.Phil. and Ph.D. in Economics from Oxford university. As official at the Mexican Telecommunications Commission (1999-2000), he was in charge of the economic evaluation of network interconnection rates. In the area of competition policy, he was an antitrust economist (2006-2008) within the European Competition Policy Practice of LECG-Brussels, Belgium. During 2008-2009, Dr. Villamayor was hired by ITAM as Senior Advisor on Regulatory Reform & Competition for the Mexican Ministry of Economics, where he was in charge of reviewing and proposing regulatory reforms in key sectors of the economy.

After a short stint as an antitrust consultant at GEA, Dr. Villamayor held the position of Chief of Advisors at the Presidency of the Federal Telecommunications Commission (2010-2011), where he provided policy advice in areas such as network interconnection, cost models, liberalization of FDI restrictions, spectrum policy, and asymmetric regulation. In the period 2011-2013, Dr. Villamayor was Director-General for Economic Regulation at the same regulatory authority and his work involved the design of asymmetric regulation for firms with market power in telecommunications markets and the design of an optimal regulatory framework to foster the entry of MVNOs in Mexico.

Currently, Dr. Villamayor is Executive President at Oxford Competition Economics, a consulting firm specialized in economic antitrust and regulation and President of the Committee for Competition in Network Industries at the International Chamber of Commerce (ICC), Mexico.