Previously, Sacks was the founding COO and product leader of PayPal[2] (acquired by eBay in 2002 for $1.5 billion)[3] and Founder/CEO of Yammer[4] (acquired by Microsoft in 2012 for $1.2 billion).[5] In 2016, he led the turnaround of Zenefits as interim CEO.[6] In 2017, Sacks co-founded Craft Ventures,[7] an early-stage venture fund, and blockchain startup Harbor[8] (acquired by BitGo[9] in early 2020) as an incubation of Craft Ventures.[10] His angel investments include Facebook, Uber, SpaceX, Palantir Technologies, Airbnb and Houzz.[11][12][13]