The collection consists of twenty-nine letters and a typed manuscript (copy) by the mathematician John Von Neumann. The letters were sent to Von Neumann's mathematics professor, Gb̀or Szeg , over a period of twenty-three years. In the first thirteen letters, penned during his high school years, Neumann writes about mathematical problems and solutions. Topics of later letters include his teaching at Princeton University, the American system of recruiting staff members, the Depression of 1934, his lectures at different universities, quantum theory and quantum mechanics, his second marriage, and his childhood friend, Princeton's Nobel laureate physicist Eugene Wigner. The typescript is a copy of a lecture titled "An Adaptation of the MADDIDA: A Digital Differential Analyser of Northrup Aircraft, Inc." According to a handwritten note at the bottom of p. 1, the lecture was presented during the Cowles Commission Conference at the University of Chicago in 1949. Also included is a photocopy of and article by Charles E. Pepper from the Princeton Alumni Weekly issue of June 7, 1966 titled "The Computer - Big Machine on Campus," in which he writes about a new computer at Princeton University and mentions the first computer built by Von Neumann, which is displayed at the Smithsonian Institute.