Harold H. Seward

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Harold Herbert Seward
Born (1930-07-24)July 24, 1930
Rutland, Vermont, United States
Died June 19, 2012(2012-06-19) (aged 81)[1]
Arlington, Massachusetts, United States
Residence United States
Citizenship United States
Fields Computer Science
Alma mater
Doctoral advisor Charles W. Adams
Known for
Spouse Janet Seward

Harold H. Seward (July 24, 1930 – June 19, 2012) was a computer scientist, engineer, and inventor. Seward developed the radix sort and counting sort algorithms in 1954 at MIT.[2] He also worked on the Whirlwind Computer and developed instruments that powered the guidance systems for the Apollo spacecraft and Polaris missile.[3][4]


  1. ^ "HAROLD H. SEWARD Obituary: View HAROLD SEWARD's Obituary by The Boston Globe". Legacy.com. 2012-06-19. Retrieved 2012-06-30. 
  2. ^ Enhanced Generic Key-Address Mapping Sort Algorithm
  3. ^ US patent 3137794, Seward, Harold H., "Directionally Sensitive Light Detector", issued 1964-06-16 
  4. ^ US patent 3657549, Low, George M.; Seward, Harold H. & Gorstein, Mark et al., "Two-Color Horizon Sensor", issued 1972-04-18