Synopsis This is a pioneering attempt to cover an in-depth biographical informations of 375 eminent psychologists from all over the world since earliest time to present day. For including the name as psychologist in this encyclopaedia, some basic principles have always been kept in mind, i.e., those who gave new dimensions in psychological thoughts and different views of all the major psychological schools and traditions of the world from different fields, times and places. Each entry of the psychologists has been written following different aspects as– Nationality; Date of birth and death (where appropriate), with places where these can be ascertained; Fields of major contributions; Details of education, professional and other appointments; Outline of the psychologist’s ideas with some indication of his reception and influence on others as well as some additional sources of informations regarding him other than those listed in the primary and secondary materials used by the author of the entry. We believe that none of the major psychologist's name have been missing from this Encyclopaedia. We have sought to represent psychologists throughout the world in the light of the different criteria which apply to different countries at different times. An authentic, outstanding and wide informative multi-volume Encyclopaedia of the World Psychologists, is compiled, edited and arranged countriwise in alphabetical order.