Now: CEO, Under Armour
First Job: Yard worker
At 10 years old, I was mowing lawns and shoveling snow in Maryland. I cut six lawns, charging $15 - $30 each to make about $150 a week in the summer. Although my service levels would really drop off when my football season started!
By 14, I was selling knit bracelets at Grateful Dead shows and at 19 I started my own t-shirt business for concerts that came through town. I kept that going at the University of Maryland, where I also had a rose business that was a big hit on Valentine's Day. After that, I started Under Armour and the rest is history.
NEXT: Marcos Galperin
Last updated October 29 2010: 7:00 AM ET