Any person who is an expert in the study of social institutions in the society and the development of humans with social circles in communities may be referred to as a sociologist. Sociologists study human behavior, their origins, evolution and other factors like their development, interactions and their collective behavioral patterns in social groups. Thus, sociologists are engaged in the scientific analysis and the examination of any social institution and its relationship and effects on the various facets of the human society. They study the reasons for behavioral change in humans over a period of time and determine the various factors that cause can in behavior. Sociology originated in the 18th and the 19th century, during the period when Western Europe was going through a host of economical, technical changes and social changes that a great impact on the social order. Sociologist may be specialized in fields like social problems, social psychology, social statistics, industrial sociology, sociology of work, sociology of occupations and professions and other files. Some other areas of specializations include race, gender, sex, cultural diversity, labor and industrial relations, personnel management and business relations. Discover some of the world’s most famous sociologists with the help of their biographies that include trivia, interesting facts, timeline and life history.