Managing Partner

Zal is the Managing Partner of Refactor. Prior to co-founding the firm with David, Zal spent 2.5 years at Andreessen Horowitz as a Partner on the investing team working across stages & sectors. He co-led investments in Omada Health,, AltSchool, Honor, etc., while helping to launch the firm's 1st Bio Fund. Before becoming an investor, Zal spent 10 years as a PM at Microsoft, Google, Netflix, and LinkedIn. He worked on emerging markets for Windows, became one of the first monetization team members at YouTube, and then co-founded a consumer mobile startup. Later, he became the 1st Head of Mobile at Netflix and helped start the Sales Solutions business at LinkedIn. Zal also volunteered as a Kiva Fellow. He has a BS in Economics from Penn's Wharton School.



David is co-founder and chairperson of Refactor. Most recently, David was the Managing Partner at SV Angel, which invested in Coinbase, Flatiron Health (acq. by Roche),, Blockstack, Doordash, Stripe, Airbnb, Slack, Climate (acq. by Monsanto), Dropbox, and many others during his tenure. He helped start the New Business Development Group at Google and spent time at Baseline Ventures, Morrison and Foerster, and the MIT Research Laboratory of Electronics. He has a JD from NYU, an MS in Electrical Eng from Stanford, and a BA from Johns Hopkins. He was a National Science Foundation Graduate Fellow while at Stanford and listed on the Forbes Midas List of Top Technology Investors. He currently serves on the Board of Directors of the Lucile Packard Foundation for Children’s Health.

Please meet our extended team. We believe that founders will increasingly need advice in their areas of expertise: regulatory guidance, culture, strategic planning, go-to-market, and communications. We are happy to call them friends as well as colleagues.


Nicole Wong

Nicole helps Refactor founders navigate regulatory and legal questions as they build their startups. Most recently, she was Deputy CTO of the USA in the Obama administration. Nicole was VP and Deputy General Counsel at Google from 2004-2011. Prior to that, she spent 10 years specializing in First Amendment law and later corporate law where she worked with PayPal, Amazon, Yahoo, & other emerging startups.


Sara Sperling

Sara helps Refactor founders develop companies as well as products. She has deep experience in team building, executive coaching, and culture. Sara is now a Partner at Oxegen Consulting, where she specializes in helping founders and their companies with their journey. She was previously Head of HR at DoorDash, Director of HR at Snapchat, and Senior Manager of Learning and Development at Facebook.


rick barber

Rick helps Refactor founders leverage data science and understand strategic opportunities within their industries. Most recently, Rick was Chief of Staff to Nuna Health's CEO. Prior to joining Nuna, Rick earned an MS in Computer Science at Stanford and a BS in Computer Science from the University of Illinois at Urbana-Champaign. While at Nuna, he helped develop and execute legislative and fundraising plans.



Tom helps Refactor founders with enterprise sales and go-to-market strategies. Tom has 20+ years of commercial experience in diagnostics, digital health, and genomics. Tom has served as CCO for Counsyl Inc, Omada Health, and is currently the CCO for Ambry Genetics. Prior to these roles, Tom held senior sales and marketing positions with Abbott Diagnostics, Siemens Diagnostics, and Quest Diagnostics.



Marc helps Refactor founders communicate better. He has extensive experience working with execs at Fortune 500s, startups, & successful companies that began as startups. Marc is founder and president of Chodorow Associates, a strategic comms consulting firm. He previously led the public and investor relations team at a major NY bank, taught public relations and journalism, and was an award-winning radio & television reporter.