Julia Kahr
Principal, private equity group
Age: 32
Kahr became the youngest principal at the firm at the august age of 29, following the precocious path forged by Schwarzman at Lehman. She's busy heading a program to buy and roll up companies that create materials used in road building -- a series of small investments that has added up to about $1 billion in enterprise value.
In a recent Crain's New York Business profile, president Tony James said Kahr had to fire an executive at a portfolio company who was also a friend, and that she did so in a way that "preserved everybody's dignity." That's a lot of composure for someone so young, but that seems to be the Blackstone way.
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Last updated October 15 2010: 2:41 PM ET
