Enzymes, being remarkable catalysts, are capable of accepting a wide range of complex molecules as substrates and catalyze a variety of reactions including a high degree of stereo- and regioselectivity in an array of reactions. As a result, enzymatic transformations, commonly referred to as “Biocatalysis” can be used in both simple and complex chemical transformations without the need of tedious protection and deprotection chemistry that is very common in traditional organic synthesis. The proposed talk would highlight our work over the last three decades on the applicability of one class of biocatalysts viz. “lipases” in useful synthetic transformations, resolution of pharmaceutically important small molecules including phenols, amides, nucleosides and their precursors, and in the development of macromolecular systems and their applications as drug / gene carriers, flame retardants, polymeric antioxidants, nanocrystalline solar cells, etc. We have recently fabricated a novel solvent-free polymer electrolyte system for sodium polymer ion batteries, which exhibits notable ionic conductivity. The results of these studies shall be presented during the Seminar.