Jack Greenfield is an investor, board member and advisor working with startups and PE portfolio companies. He chairs due diligence and serves on the executive board of Tech Coast Angels, Los Angeles. Previously, he was VP of Engineering at Personal Library Software (AOL), Founder and CTO of Inline Software, Sr. Director at PayPal, Distinguished Architect at eBay, Principal Architect at Microsoft, Chief Architect at IBM Rational, Sr. Staff Engineer at Google, and joined Apple (NeXT) and eBay (X.Commerce) spin offs. He has an MBA from UCLA Anderson with certificates in Finance and Entrepreneurship, and a BS in Physics with Biology minor from George Mason University. He has written two books and many papers and articles, and holds multiple patents. He is skilled in due diligence, valuation, operational oversight, and developing business strategy. His technical expertise is in big data, machine learning, cloud computing, ads and commerce, security and privacy.