How I Built This with Guy Raz

Drybar: Alli Webb

A decade ago, full-time mom Alli Webb noticed a gap in the beauty market: there was no place that just focused on blow-drying hair. Now with more than 100 locations, Drybar is testament to Webb's motto: Focus on one thing and be the best at it. PLUS in our postscript "How You Built That," we check back in with Chris Healy, a long-haired Southern…