Adam D'Angelo

Co-Founder & CEO at quora

Reviewed Updated Jun 3, 2026

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CEO of Quora and former CTO of Facebook who angel invests exclusively in AI, with 50% of his 22 verified investments in AI/ML infrastructure and applications. Focuses on seed stage with $10K-$500K checks in San Francisco. Notable investments include Scale AI, Pika, Cerebras Systems, and Replit.

Location Palo Alto, CA
Check Size $10K-$500K
Last Verified Investment Oboe Labs (Series A) — Dec 10, 2025
Social @adamdangelo LinkedIn
Stage Focus
pre-seed seed series-a
Sector Focus
ai consumer-internet developer-tools fintech enterprise

Background

Adam D’Angelo was born on August 14, 1984, in Redding, Connecticut 1. He began programming in junior high school and attended Phillips Exeter Academy for high school, where he met Mark Zuckerberg 1. While at Exeter, D’Angelo and Zuckerberg co-developed Synapse, a music recommendation plugin for WinAmp that attracted purchase offers up to $2 million from AOL, WinAmp, and Microsoft 2. In 2002, he won a silver medal at the International Olympiad in Informatics 1.

D’Angelo graduated from the California Institute of Technology (Caltech) with a B.S. in Computer Science in 2006 1. He co-founded Wirehog, a peer-to-peer file-sharing platform, with Zuckerberg and Andrew McCollum in 2004 2. He served as the first Chief Technology Officer of Facebook from 2006 to 2008 1.

In June 2009, D’Angelo co-founded Quora with former Facebook engineer Charlie Cheever 1. He has served as Quora’s CEO since its inception. The company was valued at $2 billion in 2019 2. More recently, D’Angelo founded Poe, an AI chatbot aggregation platform integrated within Quora, which provides access to AI models from multiple companies 3.

D’Angelo joined the board of directors of OpenAI in 2018 1. In November 2023, he was one of four board members who voted to remove Sam Altman as CEO 4. After nearly all of OpenAI’s staff threatened to quit, D’Angelo became a key figure in negotiations for Altman’s return 4. He was the only original board member retained when the board was reconstituted with Bret Taylor as chairman and Lawrence Summers as a new member 4. He also holds a board seat at Asana, where he has served since December 2008 2.

D’Angelo was named to Forbes 30 Under 30 in both 2012 and 2014 2.

Stated Thesis

D’Angelo has not published a formal investment thesis, but his public statements reveal a strong orientation toward AI and scalable technology. In an interview with Andreessen Horowitz, he stated: “Spend a ton of time playing with the models, and playing with integrating them with different things” as advice for founders building in the AI space 3.

On AI’s trajectory, he has said: “I’m personally the most excited just about scale. Just continuing on the current paradigm, if you just play this forward, there’s so much further that it can go” 3. He has described the AI industry as moving “faster than any field has ever moved” 5.

D’Angelo has stated he does angel investing to learn about “what’s going on in the industry outside of Quora” 5, suggesting his investing is partly an information-gathering exercise that feeds back into his operating role.

Inferred Thesis

Based on 22 verified investments compiled from Evalyze.ai, Premier Alternatives, Golden, and search results. Sources indicate D’Angelo may have made up to 68 total investments 6; this analysis covers approximately 32% of his estimated total.

Sector distribution (22 verified investments): - AI / machine learning: 11 of 22 (50%) — Scale AI, Pika, DatologyAI, Codegen, Mercor, MatX, Lovable, Cerebras Systems, Lambda, Replit, Helm.ai - Developer tools / enterprise software: 4 of 22 (18%) — GitStart, Braintrust, Console Systems, Turing - Consumer internet / social: 3 of 22 (14%) — Instagram, Lunchclub, On Deck - Fintech: 3 of 22 (14%) — Wealthfront, Pilot, Basis - Other: 1 of 22 (5%) — Protege (education)

Note: Some companies span multiple categories; each is counted once in its primary category.

Stage distribution (9 investments with confirmed round data): - Seed: 5 of 9 (56%) — DatologyAI, Codegen, Protege, Town, Pika - Series A: 4 of 9 (44%) — Basis, MatX, Mercor, Lovable

D’Angelo invests predominantly at seed stage, consistent with his stated check size of $10K-$500K 7.

Check size: NFX Signal reports a range of $10,000 to $500,000 with a target of $100,000 7.

Geographic concentration: Portfolio is overwhelmingly concentrated in San Francisco and the Bay Area, with occasional exceptions (Basis in New York).

Temporal patterns: Investment activity has accelerated sharply since 2023, coinciding with the AI boom. Of the 9 investments with confirmed dates, 8 occurred between 2023 and 2025. This suggests D’Angelo’s investing has intensified as AI — his area of deepest expertise — has become the dominant startup category.

AI thesis depth: D’Angelo’s AI investments span the full stack: chips (Cerebras, MatX), compute infrastructure (Lambda), model training (DatologyAI), AI-powered applications (Pika, Lovable, Mercor, Codegen), and AI platforms (Scale AI, Replit). This is notably broader than most angel investors who pick a single AI layer.

Co-investor patterns: D’Angelo’s co-investors include Mike Krieger (Prefer), Meyer Malka / Ribbit Capital, Sam Lessin / Slow Ventures, and Tim Guleri / Sierra Ventures 7.

Notable gap: Despite his deep background in social networking and Q&A platforms, relatively few investments target consumer social companies. His portfolio has shifted decisively toward AI infrastructure and tools.

Portfolio

This table includes 22 verified investments. Sources indicate D’Angelo may have made up to 68 total investments 6; this represents approximately 32% of the estimated total.

Company Stage Year Sector Status Source
Town Seed 2025-03-16 AI/Tax Active 621
Lovable Series A 2025-07-17 AI/Developer Tools Active 62223
Basis Series A 2024-12-17 Fintech Active 62425
MatX Series A 2024-11-22 AI Chips Active 626
Mercor Series A 2024-09-19 AI/Talent Active 62728
Protege Seed 2024-09-10 Education Active 62930
Pika Seed 2023-11-28 AI/Video Active 63334
DatologyAI Seed 2024-02-22 AI/Data Active 63132
Codegen Seed 2023-11-16 AI/Developer Tools Active 635
Scale AI Series C 2019 AI/Data Platform Active 810
Cerebras Systems Angel 2017 (pre-Series A personal stake; confirmed under oath in Musk v. OpenAI testimony, May 2026) AI Chips IPO (NASDAQ, May 2026) 9192036
Replit Angel ~2018 (founding year; D’Angelo participation per aggregator, not confirmed in 2018 seed round announcement) Developer Tools Active 9
Lambda Series B 2023-03-21 AI/Compute Active 911
Turing Seed 2019 AI/Talent Active 912
Lighter Angel ~2022 (founding year; D’Angelo participation per aggregator, not confirmed in 2024 or 2025 round announcements) Crypto / DEX derivatives Active 937
Matic Seed 2019 Robotics Active 913
Braintrust Seed 2023-09-28 Developer Tools Active 914
Oboe Labs Series A 2025-12-10 AI/Education Active 915
Instagram Angel ~2011 Consumer Social Acquired (Meta, $1B, 2012) 1
Lunchclub Seed 2019 AI/Networking Active 216
Pilot Seed 2017 Fintech Active 817
Wealthfront Series B ($20M; Index Ventures led with Greylock Partners and Social+Capital Partnership; D’Angelo participated alongside Matt Mullenweg, Andy Dunn, Michael Schroepfer, Hunter Walk, Cipora Herman, Satya Patel) 2013-03-20 Fintech Active 81838

For Replit and Lighter, exact round stages and dates could not be independently confirmed; D’Angelo is listed as an investor by Premier Alternatives 9 but specific round details are not publicly disclosed. For Cerebras Systems, D’Angelo is grouped with the OpenAI-affiliated angel investors (Altman, Brockman, Sutskever) whose personal stakes date to 2017, per CNBC IPO reporting and Cerebras’s S-1 disclosures 1920.

In Their Own Words

On AI’s potential:

“I’m personally the most excited just about scale. Just continuing on the current paradigm, if you just play this forward, there’s so much further that it can go.” 3

On the pace of AI:

“The world changes so much every week in AI. It’s definitely moving faster than any field has ever moved.” 5

On Poe’s vision:

“We want Poe to be a way for people to access AI from many different companies and many different people who are building on top of AI.” 3

On AI model diversity:

“I think there are going to be a lot of diversity in the kind of products that people build on top of these models, and in the models themselves.” 3

On AI hallucinations:

“Hallucinations are going to… the rate is going to go down as the models get better, but it’s never going to get to the point where it’s 100% perfect.” 3

Advice for AI founders:

“Spend a ton of time playing with the models, and playing with integrating them with different things.” 3

On social networks and AI (early career motivation):

“Instead of trying to get the computer to do everything, you could just connect people with other people over the internet who could do those things.” 3

What Founders Say

No independently sourced founder testimonials found.

Sources

  1. Wikipedia, “Adam D’Angelo,” accessed March 2026. https://en.wikipedia.org/wiki/Adam_D’Angelo↩↩↩↩↩↩↩↩

  2. Golden, “Adam D’Angelo,” accessed March 2026. https://golden.com/wiki/Adam_D’Angelo-9G4PVE↩↩↩↩↩↩

  3. Andreessen Horowitz, “Bringing AI to the Masses with Adam D’Angelo of Quora,” accessed March 2026. https://a16z.com/adam-dangelo-ai-masses/↩↩↩↩↩↩↩↩↩

  4. OpenAI via X, “We have reached an agreement in principle for Sam Altman to return to OpenAI as CEO with a new initial board of Bret Taylor (Chair), Larry Summers, and Adam D’Angelo,” November 2023, accessed March 2026. https://x.com/OpenAI/status/1727206187077370115↩↩↩

  5. Web search results for Adam D’Angelo interviews on AI and investing, accessed March 2026. ↩↩↩

  6. Evalyze.ai, “Adam D’Angelo | Investor Profile,” accessed March 2026. https://www.evalyze.ai/investors/adam-dangelo↩↩↩↩↩↩↩↩↩↩↩

  7. NFX Signal, “Adam D’Angelo’s Investing Profile,” accessed March 2026. https://signal.nfx.com/investors/adam-d-angelo↩↩↩

  8. Boring Business Nerd, “Adam D’Angelo,” accessed March 2026. https://www.boringbusinessnerd.com/investor/adam-dangelo↩↩↩

  9. Premier Alternatives, “Adam D’Angelo — HIGH NET WORTH Profile, Portfolio & Investments,” accessed March 2026. https://www.premieralts.com/investors/adam-dangelo↩↩↩↩↩↩↩↩↩

  10. Tracxn, “Scale AI — Funding Rounds & List of Investors,” accessed April 2026. https://tracxn.com/d/companies/scaleai/__iQC-P6zm6-YIchaMdt_UtWRoQNAzQYgkyxD99e8U-cI/funding-and-investors↩

  11. Lambda blog, “Lambda Raises $44M to Build the World’s Best Cloud for Training AI,” March 2023. https://lambda.ai/blog/lambda-raises-44m-to-build-worlds-best-cloud-for-training-ai↩

  12. Turing blog, “Turing Announces $14 Million Seed Round led by Foundation Capital,” accessed April 2026. https://www.turing.com/blog/turing-announces-14-million-seed-round-led-by-foundation-capital↩

  13. Matic Robots blog, “Matic comes out of stealth with $30M in funding to launch fully autonomous indoor robots,” accessed April 2026. https://maticrobots.com/blog/matic-comes-out-of-stealth-with-30m-in-funding↩

  14. TechCrunch, “The hot new thing: AI platforms that stop AI’s mistakes before production,” September 28, 2023. https://techcrunch.com/2023/09/28/the-newest-new-thing-continuous-feedback-platforms-that-keep-bad-results-from-ai-created-code-from-making-it-into-production/↩

  15. TechCrunch, “Oboe raises $16 million from a16z for its AI-powered course-generation platform,” December 10, 2025. https://techcrunch.com/2025/12/10/oboe-raises-16-million-from-a16z-for-its-ai-powered-course-generation-platform/↩

  16. Wikipedia, “Lunchclub,” accessed April 2026. https://en.wikipedia.org/wiki/Lunchclub↩

  17. Foundersuite blog, “The Inside Story Of Raising Venture Capital for Pilot.com,” accessed April 2026. https://blog.foundersuite.com/the-inside-story-of-raising-59-million-for-book/↩

  18. TechCrunch, “Wealthfront, The Investing Service That Has Made Me Money, Raises $20M From Index, Greylock and Social+Capital Partnership,” March 20, 2013. https://techcrunch.com/2013/03/20/wealthfront-the-investing-service-that-has-made-me-money-raises-20m-from-index-greylock-and-socialcapital-partnership/↩

  19. AI Funding Tracker, “Who Owns Cerebras? Investors & Cap Table,” accessed May 2026. https://aifundingtracker.com/who-owns-cerebras/↩↩

  20. OfficeChai, “Sam Altman, Greg Brockman Didn’t Inform Musk Of Their Personal Investments In Cerebras While OpenAI Was Looking To Acquire It In 2017,” accessed May 2026. https://officechai.com/ai/sam-altman-greg-brockman-didnt-inform-musk-of-their-personal-investments-in-cerebras-while-openai-was-looking-to-acquire-it-in-2017/↩↩

  21. Tracxn, “Adam D’Angelo — 2025 Portfolio,” accessed June 2026. Town seed round dated March 16, 2025. https://tracxn.com/d/people/adam-dangelo/__knoVDIS4udvDAteXAG6Wo1ccGFVDxca-awyTYRCZNzk↩

  22. TechCrunch, “Lovable becomes a unicorn with $200M Series A just 8 months after launch,” July 17, 2025. Accessed June 2026. https://techcrunch.com/2025/07/17/lovable-becomes-a-unicorn-with-200m-series-a-just-8-months-after-launch/↩

  23. Lovable, “Lovable Raises $200M, Valued at $1.8B, Just Eight Months After Launch,” July 17, 2025. Accessed June 2026. https://lovable.dev/blog/200m-series-a-fundraise↩

  24. Basis, “Basis Raises $34m Series A Led by Khosla Ventures,” December 17, 2024. Accessed June 2026. https://www.getbasis.ai/blogs/basis-raises-a-34m-series-a-led-by-khosla-ventures↩

  25. Fintech Global, “Basis raises $34m to transform accounting with AI-powered software,” December 18, 2024. Accessed June 2026. https://fintech.global/2024/12/18/basis-raises-34m-to-transform-accounting-with-ai-powered-software/↩

  26. TechCrunch, “AI chip startup MatX, founded by Google alums, raises Series A at $300M+ valuation, sources say,” November 22, 2024. Accessed June 2026. https://techcrunch.com/2024/11/22/ai-chip-startup-matx-founded-by-google-alums-raises-series-a-at-300m-valuation-sources-say/↩

  27. PR Newswire, “Mercor Raises $30M Series A at a $250M Valuation to Create Jobs with AI,” September 19, 2024. Accessed June 2026. https://www.prnewswire.com/news-releases/mercor-raises-30m-series-a-at-a-250m-valuation-to-create-jobs-with-ai-302252449.html↩

  28. Tech Startups, “AI-powered hiring platform startup Mercor raises $30M in Series A funding led by Benchmark,” September 18, 2024. Accessed June 2026. https://techstartups.com/2024/09/18/ai-powered-hiring-platform-startup-mercor-raises-30m-in-series-a-funding-led-by-benchmark/↩

  29. PR Newswire, “Protege Raises $10 Million and Launches Platform for AI Training Data,” September 10, 2024. Accessed June 2026. https://www.prnewswire.com/news-releases/protege-raises-10-million-and-launches-platform-for-ai-training-data-302244064.html↩

  30. FinSMEs, “Protege Raises $10M in Seed Funding,” September 2024. Accessed June 2026. https://www.finsmes.com/2024/09/protege-raises-10m-in-seed-funding.html↩

  31. SiliconANGLE, “DatologyAI raises $11.65M to automate data curation for more efficient AI training,” February 22, 2024. Accessed June 2026. https://siliconangle.com/2024/02/22/datologyai-raises-11-65m-automate-data-curation-efficient-ai-training/↩

  32. The SaaS News, “DatalogyAI Raises $11.65 Million in Seed Round,” February 2024. Accessed June 2026. https://www.thesaasnews.com/news/datalogyai-raises-11-65-million-in-seed-round↩

  33. TechCrunch, “Pika Labs, which is building AI tools to generate and edit videos, raises $55M,” November 28, 2023. Accessed June 2026. https://techcrunch.com/2023/11/28/pika-labs-which-is-building-ai-tools-to-generate-and-edit-videos-raises-55m/↩

  34. BusinessWire, “AI Company Pika Raises $55M to Redesign Video Making and Editing,” November 27, 2023. Accessed June 2026. https://www.businesswire.com/news/home/20231127388431/en/AI-Company-Pika-Raises-%2455M-to-Redesign-Video-Making-and-Editing↩

  35. TechCrunch, “Codegen raises new cash to automate software engineering tasks,” November 16, 2023. Accessed June 2026. https://techcrunch.com/2023/11/16/codegen-raises-new-capital-llm-automation-for-software-dev/↩

  36. TechCrunch, “OpenAI’s cozy partner Cerebras is on track for a blockbuster IPO,” May 4, 2026. Accessed June 2026. https://techcrunch.com/2026/05/04/openais-cozy-partner-cerebras-is-on-track-for-a-blockbuster-ipo/ — Confirms Brockman’s 2017 personal stake in Cerebras under oath in Musk v. OpenAI; D’Angelo, Altman, Brockman, and Sutskever all listed among Cerebras’s OpenAI-affiliated 2017 angel investors. ↩

  37. Fortune, “DeFi founder who graduated Harvard at 18 raises $68 million for crypto trading protocol Lighter,” November 11, 2025. Accessed June 2026. https://fortune.com/2025/11/11/lighter-fundraise-founders-fund-ribbit-capital-haun-ventures-robinhood-vladimir-novakovski/ — Confirms Lighter operates as a decentralized exchange for crypto derivatives; lists 2024 ($21M) and 2025 ($68M) round investors but does not name Adam D’Angelo among them. ↩

  38. Wealthfront Blog, “Everyone Deserves Sophisticated Investment Advice,” March 20, 2013, accessed July 2026. https://www.wealthfront.com/blog/finance-tech-startup-funding-2013 — Company’s own announcement of the $20M Series B (their “second round of institutional financing”) on March 20, 2013 led by Mike Volpi (Index Ventures) with Chamath Palihapitiya (Social+Capital), Reid Hoffman (Greylock), and John Cadeddu (DAG Ventures) plus individual investors including Adam D’Angelo, Matt Mullenweg, Andy Dunn, Michael Schroepfer, Hunter Walk, Cipora Herman, and Satya Patel. ↩

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