Draft paper outlining Seitz's professional career in the context of developments in the field of solid state physics. Seitz discusses his undergraduate education at Stanford University, his graduate studies at Princeton under Edward Condon and Eugene Wigner, his post in the Physics Department of the University of Rochester, the publication of his book The Modern Theory of Solids, his move to the General Electric Research Laboratories (1937), and then to the University of Pennsylvania Physics Department (1939) where he continued to work during World War II. The paper also contains accounts of many of Seitz's colleagues and their research. Those prominently mentioned include John Bardeen, Edward Condon, Lee DuBridge, Saul Dushman, Robert Hofstadter, Albert Hull, Nevill Mott, Isidor I. Rabi, William Shockley, John Slater, John von Neumann, and Eugene Wigner.