His prime research interest is in systems for multimodal detection, tracking and identification, aiming at activity recognition in intelligent spaces. To this extend he utilises signals from cameras, microphones and wearable, environmental and domotics sensors. He is co-author of the books Audio-Visual Person Tracking: A Practical Approach (Imperial College Press, London, UK, Summer 2011) and Delta-Sigma Modulators, Modeling, Design and Applications (Imperial College Press, London, UK, 2003). His research has resulted to a series of scientific publications and has been featured on regional and international media and events, while the resulting systems have been successfully evaluated at international evaluation campaigns. He has been involved in numerous EU and national research and industrial projects.