Essentials of Education Psychology About the Author S.K. Mangal (Ph.D., Education) has been Principal, and Professor and Head of Department of Postgraduate Studies at C.R. College of Education, Rohtak, Haryana. Besides authoring several books like Advanced Educational Psychology and Statistics in Psychology and Education (both published by Prentice-Hall of India), Professor Mangal has been a distinguished administrator and researcher. He has devised various educational and psychological tests and has published extensively in reputed journals.