Named "The Most Connected Man You Don't Know in Silicon Valley" by Forbes Magazine, David Hassell is a serial entrepreneur, adventurer, and organizational revolutionary.

David is currently the founder and CEO of 15Five, the leading web-based feedback and alignment solution that is transforming the way employees and managers communicate. Before 15Five, David was founder and CTO of Endai Worldwide, a New York-based marketing and services firm founded in 1999. While still serving as CTO of Endai, David co-founded Kite Adventures, an adventure travel company offering guided tours and pro-coached kiteboarding camps in Brazil.

An influential voice in the new generation of business, David coaches entrepreneurs on business strategy and has served as the President of the San Francisco chapter of Entrepreneurs' Organization, a global non-profit with the stated goal of helping entrepreneurs learn and grow. He has also been featured in The New York Times, The Wall Street Journal, Forbes, Inc., Entrepreneur, Wired, Fast Company, and the Financial Post.

David holds a BSCPE in Computer Engineering from Tufts University. He is an avid kiteboarder and skier and lives in Sedona AZ with his wife and son.