Shaun Maguire

Who they are

Shaun Maguire is a Partner at Sequoia Capital — co-founded Expanse (originally Qadium), a cybersecurity firm acquired by Palo Alto Networks for over $1 billion, and holds a PhD in quantum gravity from Caltech.

Person

Shaun started with a BA in Mathematics from USC, then stacked three graduate degrees — a Master's in Control and Dynamical Systems and a PhD in Physics (quantum gravity and quantum aspects of black holes) at Caltech, plus a Master's in Statistics at Stanford. Early in his career he worked at DARPA, including a deployment to Afghanistan — an unusual detour for a physicist that signaled an appetite for hard problems with real-world stakes. He co-founded Escape Dynamics in 2010, a space technology company working on microwave beam-powered propulsion for small satellite launch vehicles, which eventually shut down. He then co-founded Expanse (originally Qadium) in 2012, a cybersecurity firm focused on internet-scale asset discovery; Palo Alto Networks acquired it in December 2020 for over $1 billion. From there he moved into VC — first as a Partner at GV (Google Ventures), then joining Sequoia in 2019. He writes and speaks on deep tech, AI, defense, crypto, and geopolitics — active on X (@shaunmmaguire), publishes on Sequoia's blog, and has appeared on 20VC, Bankless, and Jack Altman's Uncapped podcast. The through-line is founder-turned-investor who bets at the frontier: physics, space, cyber, and now AI.

Company

Sequoia closed a $7 billion expansion fund in April 2026 — its largest fundraise in this vehicle category and the first major capital raise under new co-stewards Alfred Lin and Pat Grady, who succeeded Roelof Botha in November 2025. Doug Leone also returned as Chairman in April 2026. The fund targets late-stage AI investments in the US and Europe, with a focus on high-compute infrastructure, and nearly doubles the $3.4 billion fund raised in 2022. Sequoia also launched $950 million in new seed and venture funds for early-stage startups in 2026, split between a $750 million vehicle for companies with initial traction and a $200 million seed fund for pre-seed and seed-stage founders. In May 2026, Sequoia participated in a $30 billion funding round for Anthropic at a reported $350 billion valuation — a notable break from the VC convention of not backing rivals in the same sector, given Sequoia's existing OpenAI position.

Market

Sequoia competes against a16z, Accel, General Catalyst, Founders Fund, Lightspeed, Bessemer, Index, NEA, and KV for the most sought-after AI deals. The firm has restructured its global footprint, splitting into three independent entities — Sequoia Capital (US/Europe), HongShan (China), and Peak XV Partners (India/Southeast Asia) — in 2023, driven by geopolitical pressure and regulatory complexity around the US-China relationship. Sequoia's current view is that 2026 marks the arrival of the AI agent era, and the firm is betting accordingly, backing both OpenAI and Anthropic simultaneously.

Network

Shaun's closest peer relationships at Sequoia are with Alfred Lin and Pat Grady, who became co-stewards of the firm in November 2025 after Roelof Botha stepped down. He manages Sequoia's investments in Elon Musk's portfolio of companies — SpaceX, The Boring Company, xAI, Neuralink, and X — making him the primary relationship holder for some of the firm's most high-profile positions.

Alfred Lin· Co-steward (Managing Partner), Sequoia Capital
Pat Grady· Co-steward (Managing Partner), Sequoia Capital
Elon Musk· CEO, SpaceX / xAI / X / Neuralink / The Boring Company — Sequoia portfolio relationship managed by Maguire
Roelof Botha· Former Managing Partner, Sequoia Capital (stepped down November 2025)

How they likely show up

Co-founded two companies (Escape Dynamics, Expanse) before joining VC → brings a builder's instinct to investing; likely evaluates founders on execution credibility, not just vision.
DARPA deployment to Afghanistan alongside a physics PhD → comfortable operating in ambiguous, high-stakes environments where the theory has to meet the field.
Active on X, Sequoia's blog, and major podcasts on topics from crypto to geopolitics → publicly opinionated and comfortable being visible; not a behind-the-scenes operator.
Manages Sequoia's positions in SpaceX, xAI, Neuralink, and X → embedded in the highest-attention, longest-horizon bets at the firm; likely thinks in decade-scale cycles.
Spoke at the Pharos Foundation on free speech and information warfare → willing to engage publicly on contested political and social topics, not just technology.
Stacked three graduate degrees across Physics, Control Systems, and Statistics → signals a genuine appetite for intellectual depth; responds to rigor, not hand-waving.

Conversation tips

→ Reference a specific technical angle — he has a PhD in quantum gravity and built a microwave-beam propulsion company; he'll engage more deeply if you can match his level of precision.
→ Ask about the Expanse/Qadium journey — founding a cybersecurity company from a physics background, scaling it to a $1B+ acquisition, is a distinctive arc he's likely proud to unpack.
→ He posts publicly on geopolitics and defense, not just tech — if you want to build rapport quickly, engaging on those themes (AI and national security, information warfare) is more likely to land than generic VC small talk.
→ Don't shy away from the hard questions on Sequoia's AI bet — he's been outspoken about the AGI era thesis; he'll respect directness over deference.
→ If you've listened to his Bankless or 20VC appearances, say so and cite something specific — it signals you did the work.

Toolbox

Openers

Open on Escape Dynamics — he co-founded a microwave beam-powered propulsion company in 2010, long before space tech was fashionable; it's a window into how early and unconventionally he bets on deep tech.
Reference the Bankless episode titled 'LIMITLESS: This Is Far Bigger Than The Internet Boom' — he's gone on record with a sweeping thesis about the current tech era dwarfing the internet, and it's a natural entry point into how he's thinking about the $7B fund's AI focus.
Bring up the Sequoia-Anthropic investment alongside the OpenAI position — Sequoia backing both simultaneously is a deliberate break from VC convention, and he's at the center of the firm's AI concentration thesis.

Discovery questions

You went from quantum gravity at Caltech to co-founding a cybersecurity company to managing SpaceX and xAI investments at Sequoia — at what point did you realize the investor seat was where you could have the most leverage?
Escape Dynamics shut down and Expanse sold for over $1 billion — what did those two very different outcomes teach you about what separates companies that make it from those that don't?
Sequoia is now backing both OpenAI and Anthropic simultaneously — how do you think about portfolio construction when the upside is so concentrated in a handful of foundation model bets?

Avoid

Don't treat his public commentary on geopolitics and free speech as peripheral or awkward — he speaks at forums like the Pharos Foundation on those topics deliberately, so sidestepping them reads as unprepared rather than tactful.

Make it yours