The twelve engineers who made IBM PC were named as “The Dirty Dozen”. In July 1980, the vice president of IBM, William C.Lowe chose twelve engineers to design and build a personal computer. The first IBM PC model number 5150 was introduced on August 12, 1981. The team was headed by Don Estridge of IBM Entry Systems Division in Florida. Computer engineer David Bradley is hardly a household name. He also is one of the “dirty dozen” — a team of IBM engineers that in 1980.