Presented by Duncan Edwards Mark Dean, Scientist, Engineer Your use of today's computer may not have been possible without Mark Dean. A pioneering American computer engineer and inventor who played a critical role in developing the IBM Personal Computer in 1981, Mark holds three of its nine original patents. He led the team that created the first 1-gigahertz computer processor chip and co-invented the ISA bus, which enabled devices such as printers and monitors to connect to computers. This mont