Joe Heitzeberg (Crowd Cow CEO) on picking the right idea, validating with strangers, and scaling a marketplace

Investors laughed at the original idea for Crowd Cow. But consumers wanted to buy right away. Now they've raised $25M, grow to 90 employees, and went from selling crowd-funded cows to a complete marketplace. Joe Heitzeberg, co-founder & CEO, goes behind the scenes on his lessons validating and scaling Crowd Cow.