B Praba is presently Associate Professor, Department of Mathematics, SSN College of Engineering, Chennai. She has 22 years of research and teaching experience and has written books on Discrete Mathematics, Statistics, Random Process and Queuing Theory and Statistics for Management. She has obtained her Ph.D., from Ramanujan Institute for Advanced Study in Mathematics, Chennai.

S Kalavathy is Professor, Department of Mathematics, RMD Engineering College, Chennai. She has over 23 years of experience in teaching Mathematics and has written several books including best sellers on Engineering Mathematics and Operational Research.