Charles Goodyear has taken over as CEO of Australia’s BHP Billiton, following the resignation of Brian Gilbertson because of “irreconcilable differences” with the board. Mr Goodyear, a 44-year-old American, was chief development officer, and was BHP Ltd.’s CFO when it took over Billiton Plc in 2001 when Mr Gilbertson, 59, was Billiton’s CEO. Mr Goodyear,…