This work briefly records the lives and achievements of 502 men and women who contributed, or are still contributing, to the natural history of the Free State and Lesotho, between 1829 and 2013. This book is a very valuable addition to our knowledge of the history and biographical details of all persons who have been involved with the natural history of the Free State and Lesotho. As such, it is a unique compilation of data about many individuals that would not be possible to find elsewhere.