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C Michael Armstrong (born October 18, 1938 in Detroit, Michigan) is an American business executive and former AT&T chairman and CEO. He tried to reestablish AT&T as an end-to-end carrier but, due to the dot-com bust and various other issues, he was forced to break the group up in 2001. He resigned in 2002 and was succeeded by AT&T President David Dorman.
He is also the former CEO of Hughes Electronics, and Comcast Corporation.He worked for IBM from 1961 to 1992.He served as a Director of Citigroup from 1989 to 2010.Armstrong is a member of the Alfalfa Club and the Council on Foreign Relations.He received his BS in Business at Miami University in 1961.
In 2000 he was a board member of Citigroup and voted to oust former Citicorp CEO, John S. Reed, in favor of Sandy Weill who was co-CEO with Reed at the time. Influential analyst Jack Grubman wrote an upgraded favorable opinion of AT&T which was a reversal of Grubman's opinion just prior to that time.