Aliou Tall taught philosophy for seven years in Senegal. He pursued a post-graduate research degree in the philosophy of mathematical logic at the University of York in United Kingdom where he received a Doctorate of Philosophy in Philosophy with honor; this book is based on his thesis. For five years he worked for Non-Governmental Organizations to provide opportunities for equitable access to quality education in the developing world. Dr. Tall currently serves as Foreign Service Officer within the United States Agency for International Development working in the field of international education and development work.