He is part of the Applied Software Engineering Research Group (ISA) and is one of the most recognized researcher on software product lines, software configuration and automated analysis of software variability. He is the chair of the Steering Comitte of the Software Product Line Conference and is part of the program Committes of many others of the most important conferences on software variability in the world. He has published more than a hundred of papers in conferences and journals. One of his papers, with more than one thousand of citations, has been considered the "most influential paper" in the subject. .