Shanmuganathan Rajasekar was born in Thoothukudi, Tamil Nadu, India, in 1962. He was awarded Ph.D. from Bharathidasan University in 1992 under the supervision of Prof. M. Lakshmanan. In 1993, he joined as a Lecturer at the Department of Physics, Manonmaniam Sundaranar University, Tirunelveli. In 2005, he joined as a Professor at the School of Physics, Bharathidasan University, Tiruchirapalli. His recent research focuses on nonlinear dynamics with a special emphasis on nonlinear resonances. He has authored or co-authored more than 120 research papers in nonlinear dynamics.