Professor Surjit Singh specialises in vibratinal spectroscopy and has contributed significantly to this field for the last many years. The experimental findings in vibrational spectroscopy are supplemented by carrying out parallel work on molecular orbital calculations and other spectroscopic techniques. He has carried out commendable work on the energetics of hydrogen bonded systems as well as those exhibiting other weak molecular interactions. His early work is using UV-Visible, Infrared and NMR spectrocopies on the electrical, isotopic and steric effects on the strength and free energies of hydrogen bond. His recent studies on the Raman spectra of solvation of anions has attracted much attention. There is ample evidence that solvation of anions takes place through CH3 groups of acetonitrile, dimethylsulfoxide, nitromethane etc. In making these studies viable advanced band analysis techniques such as derivative spectroscopy, Fourier self deconvolution, Gaussian band fitting etc. have been made use of. Preferential solvation of anions in binary mixtures of solvents has also been looked into. The studies have been pursued by NMR spectroscopy as well as near infrared local mode description.