And with the right mentor, don't be afraid to expose your vulnerabilities. Admit you don't know what you don't know. When you acknowledge your weaknesses and ask for advice, you'll be surprised how much others will help.

It's ironic that retailers and restaurants live or die on customer service, yet their employees have some of the lowest pay and worst benefits of any industry. That's one reason so many retail experiences are mediocre for the public.

I think growth covers up mistakes.

I could've just walked away but I never could have forgiven myself to allow Starbucks to drift into mediocrity or not be relevant. I just couldn't be a bystander.

I was born on the other side of the tracks, in public housing in Brooklyn, New York. My dad never made more than $20,000 a year, and I grew up in a family that lost health insurance. So I was scarred at a young age with understanding what it was like to watch my parents lose access to the American dream.

On balance, I am a supporter of the minimum wage going up. We've got to be very careful what we wish for because some employers - and there could be a lot of them - will be scared away from hiring new people or creating incremental hours for part-time people as a result of that wage going up.

To stay vigorous, a company needs to provide a stimulating and challenging environment for all these types: the dreamer, the entrepreneur, the professional manager, and the leader. If it doesn't, it risks becoming yet another mediocre corporation.