Dr Ghatak has done important work on the development of methods for stereoselective synthesis of diterpenoids. This work is marked by a deep understanding of conformation of organic molecules and steric factors which control bond formation in organic synthesis. His work on intramolecular alkylation reactions using ketocarbenoid or diazoketone intermediates is of importance in relation to synthesis of gibberellin-like compounds, an important group of plant growth promoting factors.