Mayor has a number of lead positions in various companies. He has been the President of Lightsource Renewable Energy Ltd, a UK based solar energy company, since 2011. He also is the president at an international law firm, Estudio Jurídico Internacional, that specializes in Energy and Public Economy Law. Mayor is a Senior Counsel at Olswang and is also the President of the Spanish-North American Association VIA-Jefferson Circle of Spain, and Member of the Board of Directors of the European Federation ENAM. Mayor is married with two children and speaks English, French, Italian, and his native language, Spanish.