America's Top 10 Most Powerful Young CEOs 40 And Under
No.1R. Adam Norwitt 
Amphenol,Market cap: $6.7 billion,Age: 40,Industry: Technology
No.2Dara Khosrowshahi
Expedia,Market cap: $6.2 billion ,Age: 39,Industry: Travel
No.3 Keith Meister
Icahn Enterprises, Market cap: $3.4 billion,Age: 36,Industry: Diversified holding company that includes investment management, automotive, metals, real estate and home fashion.
No.4 Jon S. Brumley
Encore Acquisition,Market cap: $2.7 billion,Age: 39,Industry: Oil and gas exploration
No.5 A. Lanham Napier
Rackspace Hosting,Market cap: $2.1 billion,Age: 39,Industry: Web site hosting
No.6 David T. Blair
Catalyst Health Solutions,Market cap: $1.6 billion,Age: 39,Industry: Health care
No.7 J. Mariner Kemper
UMB Financial ,Market cap: $1. 5 billion,Age: 37,Industry: Banking and financial services
No.8 Michael G. Rubin
GSI Commerce, Market cap: $1.3 billion,Age: 37,Industry: E-commerce and interactive marketing services
No.9 Michael L. Chasen
Blackboard Express Market cap: $1.2 billion, Age: 38,Industry: Electronic learning software and services
No.10 Matthew McCauley
Gymboree,Market cap: $1.2 billion,Age: 36,Industry: Children's retailer