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Apple Wiki

Harrison Stratton "Hap" Horn (March 11, 1927June 30, 2004) was a member of the original Macintosh development team at Apple Computer.[1]

Early life and education[]

Horn was born in March 1927 in Little Rock, Arkansas. He entered the Massachusetts Institute of Technology (MIT) in 1944 and spent a year in the U.S. Navy. He received a BSEE from MIT in 1949. Horn was elected a senior member of the Institute of Electrical and Electronics Engineers (IEEE) in 1956 and received a MS in engineering services from Stanford University in 1961 as a honors cooperative program scholar. While at Stanford, he also invented the logarithmic feedback amplifier.[1] Horn married Cecelia M. "Cele" Schwarz, a native of Hicksville, New York, in Monterey, California. They had a daughter, Ginger, and stepsons John and Chris.[1][2][3]


Horn began his work during the era of vacuum tubes and co-founded Howall, where he consulted for corporations such as Philco-Ford and Data Technology. Prior to joining Apple, Horn was an employee at Fairchild Semiconductor and Hewlett-Packard.[1]

Apple Computer[]

Horn joined the Macintosh team in 1982, where he was a linear circuit designer and worked on fixing the problematic "Twiggy" drive. According to a first-hand account by journalist Michael Moritz, division manager Steve Jobs and engineering manager Bob Belleville colluded to take up Horn on one of his threats to quit. Horn left Apple in 1983 and continued work as a contractor until retiring to Los Altos, California.[2][4][5] Horn's signature is among those molded into the case of the original Macintosh 128K.[6]


Hap and Cele remained married for 34 years until he passed away in June 2004 in Palo Alto, California.[3]


  1. 1.0 1.1 1.2 1.3 Harrison Stratton "Hap" Horn, San Jose Mercury News. 2004-08-13.
  2. 2.0 2.1 Talking about ‘Oldies’, I am one (PDF) by Cecelia (Schwarz) Horn ‘44, HixNews vol.5 no.10 p.3, Hicksville High School. 2005-08.
  3. 3.0 3.1 News, Notes and Memories (PDF) by Cecelia M. Horn née Schwarz, Hicksville High School Newsletter vol.4 no.12, Hicksville High School. 2004-09.
  4. Return to the Little Kingdom p.66 by Michael Moritz. The Overlook Press. 2009.
  5. Macintosh Insiders (PDF) by Owen L. Linzmayer, Apple Confidential 2.0: The Definitive History of the World's Most Colorful Company p.107, No Starch Press. 2004.
  6. Kawasaki, Guy (1994-12-01). Macintosh Insiders Ten Years Later. Stanford University. Archived from the original on 2010-11-11.

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