Mark Graybill's primary occupation is as an aerospace engineer. He designs instrumentation and control systems for aerospace applications. His former occupations include designing large network server systems for Hewlett-Packard, testing rockets for Aerojet, and information security for commerce and defense.
He has over 30 years of experience in computer programming. He has worked in many programming languages on platforms ranging from super computers to small embedded computers.
He also has a long background as an artist. Sales of art work and cartoons helped fund his college education. He has also served as staff artist on a number of small circulation magazines and newsletters. He has provided instruction in a number of artistic styles, including cartooning, Celtic knotwork, medieval calligraphy and illumination, Anglo-Saxon art, pre-medieval Swedish art, artistic sheet metal work, and computer art.
His hobbies include astronomy, telescope-making, the making of Irish lace, preservation of early microcomputer systems, target shooting, and hobby development of computer games.
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