International Data Group, Inc. is an American media, events and research company headquartered in Needham, Massachusetts focused on the tech landscape. It is a wholly owned by Blackstone, an American alternative investment management company. Founded in 1964, it is made up of International Data Corporation and IDG Communications; the latter includes the brands CIO, Computerworld, CSO, InfoWorld, Network World, PC World, Macworld, and TechHive.
International Data Corporation was founded in 1964 by Patrick Joseph McGovern, who sold his car to fund its startup. Based in Massachusetts, the company produced a computer installation data base, and published a newsletter, "EDP Industry and Market Report" (modeled on "ADP Newsletter", which was published by The Diebold Group. Companies such as RCA, Univac, Xerox, and Burroughs paid IDC for use of the data base. During this time, McGovern continued to work as a writer for "Computers and Automation" magazine, the first computer magazine, published by Edmund Berkeley.
By its third year, the company had an income of $154,996. A modest net profit of $2,961. McGovern was considering liquidating the company when he hit on the idea of launching Computerworld in 1967, which was a continuation of the monthly newsletter, published weekly instead of monthly, in a different format, with advertising, which became a cornerstone of IDG's subsequent publishing arm. McGovern subsequently founded PC World.