Max Born was one of the most distinguished and influential physicists of the twentieth century. Although he was awarded the Nobel Prize for his fundamental researches in quantum mechanics, he made also substantial contributions to other branches of physics, for example to the theory of lattice dynamics of crystals. He created a leading school of theoretical physics at Göttingen University, which had a major impact on the development of physics. From 1936 until his retirement in 1953 he was the Tait Professor of Natural Philosophy at the University of Edinburgh. Born was a prolific writer, who published about 360 papers and 30 books. He received numerous honors apart from the Nobel Prize; he was elected Fellow of learned academies throughout the world and he was awarded many honorary degrees. 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.