"American billionaire" . . "David Duffield (born 1941) is an American businessman in the software industry. He is the co-founder and former chairman of PeopleSoft, the co-founder and co-CEO at Workday, Inc., and has been on the Forbes World's Richest People list."@en . . . "1941Z"^^ . "Duffield, David"@en . . "6.9E9"^^ .