Luis A. Fletscher received the B.S. degree in electronic and telecommunications engineering from Universidad del Cauca, Popayan, Colombia, in 2001, the M.Sc. degree in telematics from the Universidad de Murcia, Murcia, Spain, in 2010, the M.Sc. degree in telecommunications from Universidad Pontificia Bolivariana, Medellín, Colombia, in 2011, and the Ph.D. degree in energy systems engineering from the Universidad Nacional de Colombia, Medellín, in 2018. His thesis was titled Control Strategies for Energy Efficiency of Next-generation Cellular Networks with Hybrid Energy Sources and was supervised by Catalina Valencia Peroni and J. M. Maestre.