THIS YEAR'S 40 UNDER 40 (Business's hottest rising stars)

Meet this year's class of youthful movers and shakers. They're innovating, they're expanding and they're not really thinking about recession. If these youngsters can, you can also!!!!

Full list

Rank	Name	Age	Company
1	Marc Andreessen	39	Netscape, Opsware, Ning, Andreessen Horowitz
2	Mark Zuckerberg	26	Facebook
3	Evan Williams	38	Twitter
3	Biz Stone	36	Twitter
4	Raul Vazquez	39	Wal-Mart
5	Sergey Brin	37	Google
5	Larry Page	37	Google
6	Aditya Mittal	34	ArcelorMittal
7	Pony Ma Huateng	39	Tencent
8	James Murdoch	37	News Corp.
9	John Arnold	36	Centaurus Advisors
10	Marcos Galperin	39	MercadoLibre
11	Greg Jensen	36	Bridgewater Associates
12	Cesar Conde	36	Univision Networks
13	G. Mike Mikan	39	UnitedHealth Group
14	Kevin Plank	38	Under Armour
15	Wendy Clark	39	Coca-Cola
16	Elon Musk	39	Tesla, SpaceX, SolarCity
17	Boaz Weinstein	37	Saba Capital Management
18	Tim Armstrong	39	AOL
19	Esther Duflo	38	MIT, Jameel Poverty Action Lab
20	LeBron James	25	Miami Heat
21	Ryan Kavanaugh	35	Relativity Media
22	Stephen Gillett	34	Starbucks
23	Christa Davies	39	Aon
24	Lorenzo Simonelli	37	GE Transportation
25	Andrew Mason	30	Groupon
26	Charles Best	35	Donorschoose.org
27	Chris Cox	28	Facebook
27	Mike Schroepfer	35	Facebook
27	Bret Taylor	30	Facebook
28	Seth MacFarlane	37	Family Guy
29	Dennis Crowley	34	Foursquare
30	Karl-Johan Persson	35	H&M
31	Max Levchin - Tie	35	PayPal, Slide, Google
31	Rio Caraeff - Tie	35	Vevo
32	Eric Braverman	35	McKinsey & Co.
33	Ed Rosenfeld	35	Steven Madden, Ltd.
34	Marissa Mayer - Tie	35	Google
34	Salman Khan - Tie	34	Khan Academy
35	Adam Palmer	37	Carlyle Group
36	Phillip Lim	37	3.1 Phillip Lim
36	Wen Zhou	37	3.1 Phillip Lim
37	Jason Kilar - Tie	39	Hulu
37	Amit Chatterjee - Tie	38	Hara
38	Roland Fryer	33	Harvard University
39	Carolyn Everson	38	Microsoft
40	Aryeh Bourkoff - Tie	37	UBS
40	Iain Tait - Tie	38	Wieden & Kennedy

From the Nov 1, 2010 issue (FORTUNE MAGAZINE).