From the REBOL company information page (http://www.rebol.com/company.html):
"For more than 20 years Carl has been leading the design and implementation of fundamental advances in computer languages, operating systems, and distributed computing. Carl was responsible for the design and implementation of the highly acclaimed Amiga Multitasking Operating System. His background includes senior development roles at Apple Computer's Advanced Technology Group, Hewlett-Packard (Computer Systems Division), and Commodore Amiga. He was also the founder and president of Pantaray and American Multimedia, and was the co-founder and VP of Development for Videostream Inc. Carl has headed the development of Internet set-top boxes, CDTV (the world's first CD-ROM set-top box), programming languages, and multimedia content authoring systems."
He also developed RebolLanguage.