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ABBY KOHNSTAMM

IBM

Ad budget: $600 million globally

Agency: Ogilvy & Mather Worldwide

Career: Joined American Express in 1979 and moved up the marketing ranks. Was also exec assistant to then-AmEx President Louis V. Gerstner Jr., 1986-'87. Was a senior VP there in 1993 when she was recruited to IBM by its new chairman-CEO, Mr. Gerstner. One year later, Ms. Kohnstamm fired more than 80 agencies and consolidated at Ogilvy in the biggest account shift in history.

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