This is the first volume of the Biographical Dictionary of South Sudan, an ongoing research project begun in July 2001. As the subtitle of the book, the Notable Firsts, suggests, this volume is primarily concerned with historically significant South Sudanese personalities, deceased and contemporary alike, and their illustrious careers. Luminaries from all walks of life are featured, including politics, traditional leadership, civil service, academia, and sports. This book has several main aims. Its primary aim is historical. It presents biographical profiles or accounts of the entrants and highlights the accomplishments and contributions of entrants in their respective fields of expertise or in the public sphere. But the aim of this study is not only to preset entrants biographies. It is mostly to place the entries in a broader historical perspective. The biographical dictionary, though concerned about personal accounts of entrants, it discusses pivotal events that shaped the history of South Sudan. The biographies are essentially linked to historical events that shaped or influenced the countrys trajectory throughout the period in question. Central to understanding the history of South Sudan is the biographical information of personalities who have taken part in major events or who have assumed important offices in the country.