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Christa Davies, Aon
Christa Davies, Aon
40 under 40 rank: 23

Kevin Johnson, who was my boss at Microsoft and was CEO of platform and services, left Microsoft to become CEO of Juniper Networks. He was an inspiring leader. And he really took a chance with me, making me CFO at a young age. He's incredibly intelligent, amazing with people, and a visionary in pulling long-term plans for business together.

As told to Scott Cendrowski, reporter


NEXT: Marc Andreessen, Andreessen Horowitz
Last updated October 22 2010: 8:09 AM ET
40 under 40
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Full List: Top 40
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