43 of 44
40. Iain Tait - Tie
Global digital creative director, Wieden & Kennedy
Age: 38
Rank change: New
Industry: Advertising

Tait joined the Portland, Ore., ad agency in April to revive its lagging digital business -- and made his mark by turning P&G's "Old Spice Guy" campaign into a viral sensation.

NEXT: 40. Aryeh Bourkoff - Tie
Last updated October 14 2010: 1:25 PM ET
Highest paid under 40 Which young executives at public companies brought home the most bacon this year? And exactly how much bacon are we talking about? More
Where is the economy heading? This year's innovators offer their economic predictions for the next few years and beyond. More
Ones to watch They may not have made the list this year, but we're keeping an eye on these rising stars. More