Francis (Frank) E. Hamilton was born in 1898, and joined CTR in 1923 as a draftsman. He was associated over the years with Clair Lake and A. W. Mills in the development of many IBM products. He was responsible for the primary organization, design and construction of the ASCC, and for the IBM Selective Sequence Electronic Calculator (SSEC) of 1948, which was more than 250 times as fast as the ASCC. Hamilton developed the IBM 650 Magnetic Drum Calculator of 1953, of which nearly 2,000 were delivered to customers in the 1950s and 1960s, more than any electronic computer of its time. He became manager of the Endicott Laboratory in 1954, and died in 1972.