Irini Angelidaki has been appointed professor in Bioresources Engineering at the Institute. She has been working during the last 5 years as head of the Bioenergy Group. Rena has built a large research activity in biogas, biohydrogen and microbial fuel cells. She has worked with mathematical modelling of biogas processes, and is co-author to the IWA Anaerobic Digestion Model No.1.She has recently initiated research in new biorefinery concepts, where simultaneous co-production of several different energy carriers is optimised.