P. Chattopadhyay currently a senior faculty member in the Department of Mechanical Engineering, Techno India College of Technology, Kolkata, has over 25 years of teaching experience. Prior to his current responsibility, he worked as Senior Engineer (Process) at HFCL. He has authored several textbooks such as Boiler Operation Engineering, Problems on Heat Transfer, Reactions, Mechanisms and Problems in Organic Chemistry, Unit Operations of Chemical Engineering vol. I and II, Flowmeters and Flow Measurement, and Fluidized Bed Boilers. He has also contributed several technical papers and seminar articles in various journals.