José Daniel Marcos has been a lecturer in the Department of Energy Engineering at the UNED since 2002 where he has taught full time in various subjects of the old plan of first cycle, second cycle and doctorate, and currently undergraduate and master's degree, all of them related to energy, the main subject being Thermodynamics. In the field of research, he is a member of the research group Thermal Systems and Renewable Energy (STER) of the UNED since its origin in 2007. In this field he has focused his efforts on the development of new prototypes of solar cooling, which helped him to obtain the title of ‘doctor europeus’ (carried out within a doctoral programme with mention of quality) and the Extraordinary Doctorate Award. He has carried out several research stays abroad at the Delft University of Technology (The Netherlands) and at the Solar Energy Laboratory of the University of Wisconsin-Madison and his lines of research have been solar cooling, refrigeration systems and heat pumps, renewable trigeneration systems and energy analysis of thermal systems.