Social work has its roots in the social and economic upheaval wrought by the Industrial Revolution, in particular the struggle of society to deal with poverty and its resultant problems. Because dealing with poverty was the main focus of early social work, it is intricately linked with the idea of charity work, but it must now be understood in much broader terms. For instance it is not uncommon for modern social workers to find themselves dealing with the consequences arising from many other ‘social problems’ such as racism, sexism, homophobia, and discrimination based on age or on physical or mental ability. Modern social workers can be found helping to deal with the consequences of these and many other social maladies in all areas of the human services and in many other fields besides. Whereas social work started on a more scientific footing aimed at controlling and reforming individuals, it has in more recent times adopted a more critical and holistic approach to understanding and intervening in social problems. This has led, for example, to the reconceptualisation of poverty as more a problem of the haves versus the have-nots rather than its former status as a disease, illness, or moral defect in need of treatment. This also points to another historical development in the evolution of social work: once a profession engaged more in social control, it has become one more directed at social empowerment. That is not to say that modern social workers do not engage in social control (consider for example statutory child protection workers), and many if not most social workers would likely agree that this is an ongoing tension and debate. This biographical encyclopaedia provides readers with of some of the basic knowledge of World Great Social Workers.