The article is a tribute to Professor Emmett Leith, a pioneer in the development of 3D holography. It discusses his early work developing holographic synthetic aperture radar at Willow Run Laboratories in the 1950s. In the early 1960s, Leith and Juris Upatnieks invented off-axis holography, which eliminated the twin image problem and allowed them to create the first holograms of three-dimensional objects using diffuse illumination. Leith made many fundamental contributions to holography and optical signal processing over his career and received numerous honors, including the National Medal of Science. He supervised many graduate students and helped establish the University of Michigan as a leader in holographic