He was also one of the founders of Escuela Latinoamericana de Redes (EsLaRed), an organization that has been promoting information and communications technologies in Latin America since 1992, and currently serves as its president.
Pietrosemoli has worked as a telecommunications consultant in several organizations, both public and private, and since 2010 has been a full-time member of the Telecommunications/ICT4D Laboratory at the International Centre for Theoretical Physics (ICTP) in Trieste, Italy.
He holds the world’s record for the longest WiFi connection at 382 km and has been promoting low-cost data communications technologies for Internet access by teaching in many countries, as well as building wireless links in Argentina, Comoros, Ecuador, U.S., Spain, Italy, Kenya, Lesotho, Malawi, Mexico, Micronesia, Morocco, Mozambique, Nicaragua, Peru, Trinidad, Senegal, Seychelles, Venezuela, and Zambia.
He is one of the authors of the book Wireless Networks in the Developing World, which has been translated into Arabic, Burmese, Indonesian, French, Portuguese and Spanish.