G Shanker Rao, formerly the head of the department of mathematics at Government Giriraj PG College, Nizamabad, is presently a faculty member in the department of mathematics at the University College of Engineering, Osmania University, Hyderabad. He has nearly 37 years of experience in teaching numerical analysis, real analysis, graph theory, and statistics to undergraduate and postgraduate students. A prolific writer, he has authored more than 25 books and several research papers.