Dr. Mark Dean has been with IBM since 1980. Dr. Dean holds 3 of the original 9 patents on the computer that all PCs are based upon. Soon after joining IBM, Dr. Dean and a colleague, Dennis Moeller, developed the internal architecture that enables multiple devices, like modems and printers, to be connected to personal computers. He earned his Ph.D. in Electrical Engineering in 1992. In 1995 Dr. Dean was named an IBM Fellow, one of only 50 active fellows of IBM's 200,000 employees. Dr. Dean was the first African American to be honored with an IBM Fellowship.