Dhritiman Chatterjee is an Indian actor. He began his acting career in 1970 as the protagonist of Satyajit Ray's Pratidwandi. Most of his acting work has been in India's "parallel", or independent, cinema with filmmakers such as Satyajit Ray, Mrinal Sen and Aparna Sen, among others and is noted for his acting skills. He has also worked in English films with well-known filmmakers such as Deepa Mehta and Jane Campion.

Professor Trilokeshwar Shonku is a fictional scientist and inventor created by Satyajit Ray in a series of Bengali science fiction books of the same name published from 1965 on. He is the central protagonist of the series. Professor Shonku resides in Giridih. His house contains a laboratory, and he lives with his pet cat, Newton, named after Sir Isaac Newton and his man-servant, Prahlad. He was born in the year of 1912 but his year of death is unknown.