Emil Wolf was the Wilson Professor of Optical Physics at the University of Rochester. He received B.Sc. and Ph.D. degrees from Bristol University and a D.Sc. degree from the University of Edinburgh. He joined Max Born there in 1951 to collaborate with him in the writing of Principles of Optics. He was Max Born's last assistant. In addition to Principles of Optics, Professor Wolf was the co-author, with Professor Leonard Mandel, of a comprehensive text Optical Coherence and Quantum Optics, and he was the editor of a well known series, Progress in Optics. His numerous contributions to optics are well known and have been recognized by many awards, including seven honorary doctorates. Professor Wolf was President of the Optical Society of America in 1978 and was an honorary member of that society, as well as of the Optical Societies of India and Australia.