General Partner @a16z. Previously: Firmwide Strategy @GoldmanSachs, Founder, CEO @onbondstreet and VC @SparkCapital. @Harvard biochem.

Joined December 2007
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¡Viva México! ¡Viva @a16z! 🇲🇽
En Palacio Nacional, recibimos a Ben Horowitz, cofundador y socio general de la firma financiera Andreessen Horowitz. Coincidimos en que México es ejemplo de confianza y certeza económica.
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David Haber retweeted
Today, SpaceX begins trading publicly on Nasdaq under the ticker $SPCX. Congratulations to @elonmusk and the entire @SpaceX team from @a16z! Ad Astra 🇺🇸
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David Haber retweeted
Fantastic interview of Lloyd Blankfein (former Goldman Sachs' CEO) by @dhaber If you don't want to read Lloyd's new autobiography (but you should) then this interview is the next best thing. Of all my CEOs, Lloyd was the most helpful on all things cyber - largely because of the firm's culture of risk management and the nature of the Partnership structure. Summary infographic (courtesy of NotebookLM) here. a16z.simplecast.com/episodes…
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Love this! Moment now powering Ramp’s cash management product. 🤝
Today, @_MomentHQ and @tryramp are announcing our partnership to make institutional cash management accessible to every finance team. For years, embedded fintech products have offered basic cash storage that works for early-stage companies but fail as businesses scale. On the other hand, banks offer direct access to fixed income SMAs, but do so without the sexy UX embedded fintechs have. The result is that most businesses either leave money on the table or spend significant time and resources to do something about it. Through our partnership, the same fixed income system that powers trading and portfolio management for firms managing over $10 trillion in assets is now fully embedded directly inside Ramp, giving 70,000 finance teams institutional tools to optimize yield through a platform they already love and use every day. This has been years in the making — thank you to all of those at Ramp for connecting the dots so early and to @apexfintech for helping us deliver a world-class solution. Read the full announcement here: prnewswire.com/news-releases…
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David Haber retweeted
40,000 people. 1,500 events. One week. 🗽 NY Tech Week is one of the biggest moments in NYC's tech calendar. @dhaber, General Partner of @a16z, discusses the future of New York as a global tech hub. The full conversation: youtube.com/watch?v=donzQWUN…
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"From the outset, a16z has been organized as a firm, not a fund whose purpose is to help founders build amazing businesses, and to do it as much as possible. We have been uncompromising on this tradeoff since day one. Today there is an added mission and a call to help not just founders, but America and her allies. We’re answering that call." - @bhorowitz
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Replying to @dhaber @a16z
I figure the statute of limitations has run out on privacy so. This was pre-AI, I wrote this entirely myself!
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Same! @arampell passed on Bond Street back in 2016 (and likes to remind me that it was a very nice note 😆) - it was fwiw! And then several years later recruited me to @a16z / now we’re partners. Careers are long and you never know how life re-intersects! 💫
In 2019 @a16z passed on investing in a complex @opendns round but did so fast respectfully so I raised from other folks and made everyone a lot of money and now I work at @a16z with @pmarca and @bhorowitz and the amazing team building American Dynamism and I love it. 🙂
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Thank you for the feature and for the dose of AI optimism @LydiaMoynihan! 🗽 nypost.com/2026/06/04/busine…
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David Haber retweeted
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David Haber retweeted
Today, I’m excited to join Andreessen Horowitz as a General Partner and Head of Global Affairs. This is my next chapter in the mission of securing America at home and ensuring technological innovations are adopted to keep us safe, working together with our allies to build a more secure and prosperous future. Today, as the U.S. and China compete on the global stage, the spread of technology is tinged with geopolitics and more fragmented. Security now requires a focus on digital sovereignty, supply chain resiliency, and the trustworthiness of the infrastructure underpinning our economies and our national security. My full announcement: a16z.news/p/technology-is-se…
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Go Lassie!
Today, we're introducing Lassie and $47M in funding led by a16z. We're building AI that runs small businesses, starting with doctors' offices. Lassie is already trusted by 700 practices across the country, working autonomously to provide them with 30 hours of labor per month. To get here, we first had to leave Robinhood and Superhuman to work in offices ourselves. Here's how that went.
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Thrilled to be working with JDG and Tony! Love the @TownAI product.
Today, we’re launching @TownAI: the AI assistant that learns you. We’re coming out of beta with a $55M Series A led by @ARampell at @a16z, with participation from @KirstenGreen at @forerunnervc and continued support from @firstround, @altcap, and @conviction. Right now, getting real value from AI means prompting, configuring, building workflows, managing agents. We think that’s backwards. The future of AI is a companion that already knows you and how you work. Town connects across your inbox, calendar, Slack, docs, messages, and workflows to understand what you need, then starts doing the work with you. Drafting. Scheduling. Project tracking. Follow-ups. Context gathering. Multi-step tasks. And it only acts when you say so. All adapting to your voice, priorities, routines, and relationships over time. Your Townie is the AI assistant you actually need.
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.@jesslionness' story hit me right in the chest -- raw, honest, and full of the fire that built this country. My dad reminded me this morning of our own family’s journey: from my grandmother’s time in a Romanian labor camp during WWII, to where we stand today. Different path, same spirit. That uniquely American one. Proud to have you at @a16z, Jessica! It's time to build! 🇺🇸💪
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David Haber retweeted
If you're a VC, watch this to see @dhaber's top three most exciting companies he invested in with @a16z
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David Haber retweeted
Could the system of record become free? @dhaber from Andreessen Horowitz with a very interesting take... Full episode in the comments.
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Cribbing from a @spolsky classic in “commoditizing your complements” when it comes to AI companies competing with the incumbent systems of record in their market.

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