An icon in the world of optics, Emil Wolf laid the foundations of contemporary physical optics by documenting the concept of spatial coherence before lasers were introduced. This powerful concept has influenced many areas of optical science and engineering, several of which are discussed in this book and are intended to pay homage to one of the great minds of physical optics. The material is presented by major experts in the field, many of them closely connected to Emil Wolf's Institute of Optics at University of Rochester.