Gautam R. Desiraju is a structural chemist who has been in the Solid State and Structural Chemistry Unit of the Indian Institute of Science, Bangalore, India since 2009. Prior to this, he had been in the University of Hyderabad for 30 years. He has played a major role in the development and growth of the subject of crystal engineering. He is noted for gaining acceptance for the theme of weak hydrogen bonding among chemists and crystallographers. His books on crystal engineering (Elsevier, 1981; World Scientific, 2011) and the weak hydrogen bond in structural chemistry and biology (OUP, 1999) are particularly well known. He is one of the most highly cited Indian scientists with more than 375 research papers, 22000 citations and an h-index of 68. He has won international awards such as the Alexander von Humboldt Forschungspreis and the TWAS award in Chemistry. He has guided the Ph.D work of around 35 students. He has edited three multi-author books in solid state and supramolecular chemistry. He is a member of the editorial advisory boards of Angewandte Chemie, Journal of the American Chemical Society and Chemical Communications. He is the Immediate Past President of the International Union of Crystallography.