It's critical for women to learn from one another, according to Cheryl Giovannoni, CEO of Ogilvy & Mather Advertising in the U.K. "Women being there for each other, providing moral support, mentoring and guiding, and giving valuable time, is something that doesn't happen enough," she writes. During her career, Giovannoni writes, she has learned the value of being well-informed and being ready to address tough problems.

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