"Do exactly as David says, and you will indeed become unstoppable."

Mark Sisson

Founder of Primal Kitchen & New York Times Bestselling Author

"David is the silent business killer. Very unassuming but this advices is always on point and ahead of his time"

Noah Kagan

Facebook, Mint & Sumo.com, OkDork

"High on insights, low on fluff. I always look forward to getting David's weekly emails."

Jordan Harbinger

The Jordan Harbinger Show

"David's advice is reasonable, straightforward, and most importantly - backed by data."

Dharmesh Shah

Founder of HubSpot

"David has always been ahead of the curve."

Andrew Warner

Mixergy