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 in 2020, and Escape Dynamics, a microwave beam-powered space propulsion company.

Person

Shaun started at USC with a BS in Mathematics, then accumulated three graduate degrees: an MS in Control and Dynamical Systems and a PhD in Physics (quantum gravity, advised by John Preskill at Caltech's Institute for Quantum Information and Matter), plus an MS in Statistics from Stanford. Between degrees he worked at DARPA — including a deployment to Afghanistan — and at DRW Trading Group, picking up defense and quantitative finance experience well before he touched venture capital. He co-founded Escape Dynamics in 2010, a space technology company built around microwave beam-powered propulsion for small satellite launch vehicles (later shut down), and co-founded Qadium in 2012, a cybersecurity firm that mapped hidden internet-connected devices at scale; Qadium rebranded as Expanse and was acquired by Palo Alto Networks in December 2020 for over $1 billion. From there he moved to GV (Google Ventures) as a Partner before joining Sequoia Capital in 2019. At Sequoia he manages the firm's investments in SpaceX, The Boring Company, xAI, Neuralink, and X. The through-line is a founder-scientist who built real things in defense, space, and cybersecurity before becoming the investor who backs others doing the same. He writes on X (@shaunmmaguire), publishes on TechCrunch and Sequoia's blog, contributed to the Quantum Frontiers blog on quantum information, and maintains a personal site at shaunmaguire.us focused on pro-West political commentary; his public voice spans VC, AI, defense tech, and geopolitics, and he has appeared on 20VC, Bankless, CNBC Squawk on the Street, and the Uncapped podcast with Jack Altman.

Network

At Sequoia, Maguire's closest peer partners are Pat Grady and Alfred Lin, who stepped into new leadership roles after Roelof Botha stepped down in November 2025. His most prominent portfolio relationship is with Elon Musk, whose companies — SpaceX, The Boring Company, xAI, Neuralink, and X — Maguire manages on Sequoia's behalf. His academic network traces back to Caltech, where his PhD advisor was quantum computing pioneer John Preskill.

Pat Grady· Partner, Sequoia Capital
Alfred Lin· Partner, Sequoia Capital
Roelof Botha· Former Managing Partner, Sequoia Capital
Elon Musk· CEO, SpaceX / xAI / X / Neuralink / The Boring Company
John Preskill· PhD Advisor, Caltech Institute for Quantum Information and Matter

How they likely show up

Co-founded two companies (Escape Dynamics, Expanse/Qadium) while simultaneously pursuing multiple advanced degrees → high tolerance for parallel complexity; likely runs multiple threads at once and expects the same from people around him.
DARPA work including a deployment to Afghanistan → shaped by adversarial, high-stakes environments; probably evaluates risk through a national-security lens, not just a financial one.
PhD in quantum gravity under John Preskill → comfortable going very deep technically; will probe the physics or math of a claim rather than taking it on narrative alone.
Active public voice on X, TechCrunch, Sequoia's blog, and multiple podcasts covering VC, AI, defense, and geopolitics → comfortable being visible and opinionated; not shy about staking out positions others might avoid.
Manages Sequoia's stakes across SpaceX, xAI, Neuralink, The Boring Company, and X → operates at the intersection of frontier tech and political economy, not purely financial return.
Joined Sequoia in 2019 after building and exiting a company above the $1 billion mark → brings operator credibility to every founder conversation; he's been on the other side of the table.

Conversation tips

→ Come with a specific technical thesis, not a trend: he did a PhD in quantum gravity and co-built a cybersecurity company from DARPA research — he'll engage on depth, not buzzwords.
→ Reference Expanse/Qadium specifically — the arc from DARPA research to a $1B+ exit is a formative story and signals what he looks for in companies with defense or dual-use DNA.
→ He posts prolifically on geopolitics and defense tech, so engaging with a specific post or argument he's made publicly will signal you've done the work — generic flattery won't move him.
→ Don't treat his political commentary as separate from his investing thesis — his public writing on information warfare and national security is directly connected to the categories he bets on.
→ He's appeared on Bankless, 20VC, and CNBC; if the meeting has a crypto or AI angle, he'll have an articulated view — come prepared to push back or build on it, not just absorb it.

Toolbox

Openers

Open on Expanse/Qadium: he co-founded a cybersecurity company out of DARPA research, scaled it to a $1B+ exit to Palo Alto Networks in 2020, and now invests in similar founder profiles — asking what made that company defensible from first principles is a direct line into how he thinks about durable companies.
Reference his Pharos Foundation talk 'Refounding Democracy: Free Speech and Information Warfare' — it's a named public commitment on information warfare as a structural problem, not a hot take, and connects directly to his content themes across X and his personal site shaunmaguire.us.
Bring up Escape Dynamics — the microwave beam-powered propulsion company he co-founded in 2010 and that ultimately shut down. It's the bet that didn't work, which is often more instructive than the one that did, and shows you know his full arc.

Discovery questions

Qadium started as DARPA research and became a $1B exit — how much of that outcome was the defense-sector origin, and how much would have been replicable in a purely commercial cybersecurity company?
You manage Sequoia's positions across SpaceX, xAI, Neuralink, The Boring Company, and X — when those companies pull in the same direction versus create competing priorities, how do you navigate that as an investor?
Your public writing spans quantum physics, defense tech, VC, and geopolitics — do you see those as genuinely connected theses, or do you keep them compartmentalized when you're evaluating a new investment?

Avoid

Don't pitch AI or defense themes at a surface level — he built a DARPA-sourced cybersecurity company to a $1B exit and manages investments in SpaceX and xAI, so he'll dismiss any framing that doesn't engage with the technical or geopolitical specifics underneath the headline.

Make it yours