William Wilson Morgan (January 3, 1906 - June 21, 1994) was a Professor Emeritus at Yerkes Observatory in Wisconsin, and whose work on the properties of stars and galaxies was fundamental in the creation of modern astronomy during the second half of the twentieth century. He graduated from the University of Chicago in 1927, earned his doctorate there in 1931, and, the next year, was appointed an instructor at the famed Yerkes Observatory. Morgan spent his entire 68-year career at the observatory, and devoted his research to morphology, the classification of objects by their form and structure. He discovered "flash" variable stars (stars with rapidly changing luminosity). Professor Morgan's pioneering research in structural classification led to a new accuracy in our knowledge of the distances of stars. He also provided the first evidence of the spiral structure of the Milky Way Galaxy, in "one of the grandest feats of its kind in scientific history." He was the recipient of the Henry Draper Medal, presented by the National Academy of Sciences, and the Herschel Medal of the Royal Astronomical Society. W.W. Morgan participated in the 1985 Achievement Summit in Denver, Colorado, and addressed the student delegates about his career as an astronomer.