I started my research work on the development of the biomethanation process in 1980. I successfully conducted the Pilot Plant studies on the biomethanation process at IIT Delhi; M/s. Daurula Sugar Works Ltd, Daurula, UP; M/s. Citurgia Biochemicals Ltd., Surat. Biohydrogen research work was initiated in 1999. We have made commendable contributions towards development of a commercially competitive and environmentally benign bioprocess began with the isolation and characterization of high-yielding hydrogen producing bacterial strain Enterobacter cloacae IIT-BT 08, which, as of today, is known to be the highest producer of hydrogen by fermentation. Also established that Fe-H2se from E. cloacae is cytoplasmic, monomeric, metalloenzyme with molecular weight of 51 kDa. This group worked on the development of a novel two-stage fermentation process (dark-fermentation followed by photofermentation) with a view towards amelioration of hydrogen productivity. They are also involved in Pilot Plant studies for the commercial exploitation of the process using cane molasses, rice mill wastes, distilery effluent, sewage sludge, etc. The aim was to synchronize the bioremediation of wastewater with clean energy generation. They have two Indian Patents , more than 165 publication in the peer reviewed journals and 38 book chapters. I received Akira Mitsui award of International Association of Hydrogen Energy at WHEC 2008 at Brisbane, Australia. This was followed by Malaviya Memmorial award 3013 of Biological Research Society of India at Jawaharlal Nehru University, New Delhi. Recently, our research group developed biohythane process for the maximization of gaseous energy recovery from the organic wastes. 10,000 L Biohydrogen Pilot Plant was designed, fabricated and commissioned at IIT Kharagpur. Technology License agreement of the process has already transferred to M/s. Dhampur Sugar Mills Ltd., Dhampur, UP, India. We successfully demonstrated the paper based microbial fuel cell which may be explored for the development of biosensors. Air lift photobioreactor was found suitable for the sequestration of CO2 as compared to others like flat plate panel reactor, bubble column reactor etc. I have several sponsored research projects from International (National Science Foundation, USA; Norwegian Foreign Ministry, Norway; Danish Research Council, Denmark, DAAD, Germany) and National (Ministry of New and Renewable Energy Sources; Department of Science and Technology; Department of Biotechnology; Defence and Research Development Organization) funding agencies.