Mr. David Marcus serves as Advisor at Felix Capital. Mr. Marcus served as Board Member at Coinbase. He formerly served as Vice President, Messaging Products at Facebook. He also served as President at Paypal. He was the Founder and Chief Executive Officer of Echovox. He is a Founder and Chief Executive Officer at Zong. He started his first company, GTN telecom, back in 1996 in Geneva, Switzerland. GTN was acquired by World Access in 2000. In 2000, he founded Echovox, he build direct relationships and connections with mobile operators around the world. This formed the foundation for Zong, which was spun out of Echovox.