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David Briefstein

Head of Accelerate , San Francisco Office


“Learn the rules like a pro, so you can break them like an artist.” – Pablo Picasso

At Comcast Ventures

David leads Comcast Ventures’ Accelerate Program, providing support to portfolio companies on growth strategy and execution.  From TV ad campaign design to online marketing guidance, Accelerate helps drive customer acquisition, lifecycle marketing and retention initiatives.

Before Comcast Ventures

Prior to joining Comcast Ventures, David was the Chief Revenue Officer at Madison Reed. Before that, he was the VP of Product Marketing and Mobility at SiriusXM’s Connected Vehicle business unit. David has also held leadership roles at PlasmaNet, Washington Mutual and Home Value Protection.


David holds a bachelor's degree in Business from the University of Minnesota’s Carlson School of Management. 

Fun Fact

"Even when I was teaching scuba diving in Thailand and Honduras, I couldn’t resist the opportunity to dabble in a few side businesses from opening a bar to chartering a 75-foot sailboat for week-long dive trips."

David Briefstein
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