Question: Which of the co-founder of "General Magic" was born in 1951?

Context articles: Robert C. Gay
General Magic
Magic Cap
Telescript (programming language)
Magic Link
Bill Atkinson
Motorola Envoy
Darin Adler
Andy Hertzfeld
Scott Knaster

Robert Christopher Gay (born September 1, 1951) has been a general authority of The Church of Jesus Christ of Latter-day Saints (LDS Church) since 2012.
 Prior to becoming a general authority, Gay was the managing director, co-founder, and chief executive officer of Huntsman Gay Global Capital, a private equity firm headquartered in Palo Alto, California, with offices in Florida, Massachusetts, and Utah.
General Magic was a company co-founded by Bill Atkinson, Andy Hertzfeld and Marc Porat that developed a new kind of handheld communications device they called a "personal intelligent communicator", which was a PDA precursor that stressed communications.
 During the early 1990s, Joanna Hoffman was vice president of Marketing.
Magic Cap (short for Magic Communicating Applications Platform) is a discontinued object-oriented operating system for PDAs developed by General Magic.
 Tony Fadell was in charge of the platform.
 Darin Adler was an architect.
Telescript is an object-oriented programming language written by General Magic as part of the overall Magic Cap system.
 Telescript programs used a modified C-like syntax known as High Telescript, and were compiled to a stack-based language called Low Telescript for execution.
 Low Telescript ran within virtual machine interpreters, or "Telescript engines", on host computers.
The Magic Link was a personal communicator and PDA marketed by Sony from 1994, based on the General Magic's Magic Cap operating system.
 The Magic Link was brought to market by Jerry Fiala Sr at Sony.
 The "Link" part of the name refers to the device's ability to send and receive data over a modem.
Bill Atkinson (born 1951) is an American computer engineer and photographer.
 Atkinson worked at Apple Computer from 1978 to 1990.
The Motorola Envoy Personal Wireless Communicator was a personal digital assistant released by Motorola in summer 1994.
 It was built to run General Magic's Magic CAP operating system, and it combined wireless, telephone, and infrared modems in a single PDA package.
Darin Adler was the technical lead for Apple Computer's System 7 operating system release.
 During 1985–1987 he worked for ICOM Simulations as primary developer of the MacVenture game engine which ran Déjà Vu: A Nightmare Comes True, Uninvited, and Shadowgate.
 Adler went on to work at General Magic and Eazel.
Andy Hertzfeld (born April 6, 1953) is an American computer scientist and inventor who was a member of the original Apple Macintosh development team during the 1980s.
 After buying an Apple II in January 1978, he went to work for Apple Computer from August 1979 until March 1984, where he was a designer for the Macintosh system software.
 Since leaving Apple, he has co-founded three companies: Radius in 1986, General Magic in 1990 and Eazel in 1999.
 In 2002, he helped Mitch Kapor promote open source software with the Open Source Applications Foundation.
 Hertzfeld joined Google in 2005, and in 2011 was the key designer of the Circles user interface in Google+.
Scott Knaster is an American technical writer who has written many books, mostly dealing with Macintosh programming and using the Macintosh.
 He has worked for such companies as Apple Inc., General Magic, Microsoft, Danger Inc., and Google.