Dr Nayak graduated in Civil Engineering from College of Engineering and Technology, Bhubaneswar in 1993. He received master degree in Water Resources Engineering from Indian Institute of Technology, Kharagpur in 1995. He is working as Scientist at National Institute of Hydrology, Kakinada since 1998. Subsequently, he completed his Doctorate degree from Indian Institute of Technology Madras, Chennai in 2008. He is working in the area of surface water modeling using soft computing techniques. His major research contributions include development of models and software tools for hydrologic modeling using fuzzy and neurofuzzy computing techniques. Currently he is doing research on the impact of climate change on water resources. He is acting as Editorial Board member for Journal of Hydrology, Elsevier Sciences.