Gilles Horowitz obtained a master's degree in physics from the University of Paris 7 in 1972, and a DEA in solid state physics from the same university in 1973. He defended his thesis in semiconductor physics in 1975 following an internship at the Centre National d'Etude des Télécommunications in Lannion (Côtes d'Armor). A year later, he joined the Centre National de la Recherche Scientifique (CNRS) as a research fellow, with an assignment at CEA-Saclay, which led to the defense of a state thesis on the photo-electrochemical conversion of solar energy in 1981. The following year, he joined the Molecular Materials Laboratory in Thiais (Val de Marne). In 1988 he launched a research program on organic electronics which led one year later to the realization of one of the very first organic field effect transistors. He was then appointed to the University of Paris Diderot in 2000 where he was a professor between 2005 and 2008. He led a team of four researchers and professors, five PhD students and two post-doctoral researchers. Finally, in 2010, he joined the Laboratoire de Physique des Interfaces et des Couches Minces at École Polytechnique, in the Large Surface Electronics Applications group. His current research interests include the modification of interfaces in organic electronic devices using self-assembled layers, and the theoretical modeling of the operation of these devices. In 2010, he launched a program on the realization of biological sensors built on organic transistors. He is author or co-author of more than 200 publications and communications in international journals or conference proceedings. He has been involved in teaching organic electronics since 2004, first at the University of Paris-Diderot, then at the Ecole Polytechnique. Gilles Horowitz retired in July 2014 and is since then Director of Research Emeritus at CNRS.