Patrick C. Hallenbeck, microbiologist, obtained a Ph.D. in Biophysics from the University of California Berkeley (USA) and held post-doctoral positions at the French Nuclear Energy Center, Grenoble (France), and the University of California, Davis (USA) before taking up a position as professor in the Department of Microbiology and Immunology, University of Montreal. Dr. Hallenbeck’s research interests are in microbial physiology, applied microbiology and biotechnology, biological energy production, anaerobic metabolism, and nitrogen fixation. Dr. Hallenbeck is the Canadian representative to Task 21 (Biohydrogen) of the Hydrogen Implementing Agreement of the IEA and President of the Biohydrogen subdivision of the International Hydrogen Association. He has served on the organizing committees of numerous international conferences, was chair of ISPP2009, and is chair of BioH2 2013. He is author of over fifty original research publications, twenty-two reviews and book chapters, and numerous abstracts in conference proceedings. He is editor of two books. Prof. Hallenbeck won Outstanding Scientist award for 2012 from the IFIBiop (www.ifibiop.org). He is currently researching the role of metabolite sensing and signalling in the regulation of microbial metabolism, and using metabolic engineering to increase biofuels production. He is editorial board member in Bioresource Technology, Frontiers in Microbiology, and Marine Biotechnology.