As expected, research and advisory firm Gartner today officially announced that former IDC World Expo CEO Charlie Greco has joined the company as senior vice president for worldwide events. Greco will report to Leon Shapiro, senior vice president and general manager of Gartner Community, and will be responsible for driving the growth and reach of Gartner’s industry-leading events business. Greco had been heavily involved in negotiations with Apple on getting the company to attend the 2004 Macworld Expo in Boston and the New York Expo this July.