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    BT Group's Openreach

As strategy director for BT (formerly British Telecom), Garfield made the $4 billion case for building out fiber broadband to 19 million U.K. homes. Now, as CEO of BT’s infrastructure division, she’s doing it, managing more than 20,000 engineers. Recently named to the board of British megachain Tesco, she’s said to be a contender one day for BT’s top spot.