Mark Dean: The Black Engineer Who Built the Backbone of Your Computer They sold us the myth that tech was never our lane. Then Mark Dean rewired the map. 💻⚡ Long before Silicon Valley became a buzzword, a Black engineer at IBM helped build the personal computer as we know it. Mark E. Dean is a co-inventor of the IBM PC and holds three of the original nine patents that made modern computing possible. His most powerful contribution—the ISA bus—is the invisible backbone that lets your keyboard, mo