Delian Asparouhov

Who they are

Delian Asparouhov is a Partner at Founders Fund — dropped out of MIT, did the Thiel Fellowship, and co-founded Varda Space Industries, a company manufacturing pharmaceuticals in low Earth orbit that became a unicorn in 2025.

Person

Delian attended MIT studying Computer Science from 2011 to 2013, then dropped out as a Thiel Fellow — a signal that frames everything that follows. He launched Nightingale, a YC Summer 2014 clinical decision-support app, and served as its CEO through 2016. He then moved into growth roles at Teespring and Square before becoming Chief of Staff to Keith Rabois at Khosla Ventures — a classic proximity-to-power move that gave him a VC education. In 2019 he joined Founders Fund as Principal, was promoted to Partner in June 2023, and in 2020–2021 co-founded Varda Space Industries with Will Bruey — a space manufacturing company focused on producing pharmaceuticals and advanced materials in microgravity that hit unicorn status in 2025 after raising $187 million. He also created the Hill and Valley Forum, a convening body at the intersection of tech and policy. He runs the Operators podcast on Substack at delian.substack.com, which interviews non-founder, non-VC operators who make the startup world function — a pointed editorial choice that reflects his interest in the under-credited execution layer. The through-line: he keeps one foot in institutional capital and one in company-building, never settling into a purely observer role.

Company

Founders Fund's most recent move is leading Nominal's $80 million Series B-2 acceleration round in August 2026, pushing the industrial software company to a $1 billion valuation. That deal sits inside a period of extraordinary capital deployment: in 2026 the firm closed Founders Fund Growth IV at $6 billion — its largest growth-stage vehicle — pushing total AUM past $20 billion. In 2025, the firm participated in OpenAI's $8.3 billion round, invested $1.25 billion in Anthropic at a $350 billion valuation, and backed Anduril at a $30.5 billion valuation. SpaceX, Founders Fund's largest position, filed for what sources described as the largest IPO in history in April 2026, expected near a $1.75 trillion valuation.

Market

Founders Fund competes with Sequoia Capital, Andreessen Horowitz, and Lux Capital for frontier-technology deals, but distinguishes itself through concentrated, conviction-based bets and a willingness to lead in defense and national security — sectors most mega-VCs still treat as peripheral. Geopolitical dynamics are actively shaping its portfolio thesis: investments in Anduril, SpaceX, and defense-adjacent companies like Northwood Space reflect a deliberate bet that government-adjacent technology will define the next capital cycle. With roughly $17 billion in AUM as of 2025, 51 unicorns, 28 IPOs, and 129 acquisitions across the portfolio, the firm is now operating at a scale where it regularly takes primary institutional investor positions and board seats in the largest private technology rounds.

Network

Delian's most legible professional anchor is Keith Rabois, to whom he served as Chief of Staff at Khosla Ventures — that relationship shaped his entry into institutional VC. At Varda Space, his core co-founder relationship is with Will Bruey, who co-founded the company with him in 2021. His podcast, Operators, extends his network into the operator class — mid-level operators who run functions inside startups — though no specific guests surface from the available claims.

Keith Rabois· Former principal at Khosla Ventures (Delian's Chief of Staff supervisor)
Will Bruey· Co-founder, Varda Space Industries
Peter Thiel· Founder, Founders Fund (Delian's firm since 2019)
Trae Stephens· Partner at Founders Fund, co-founder of Anduril Industries

How they likely show up

Dropped out of MIT for the Thiel Fellowship and immediately started a company → shows high tolerance for unconventional paths and an early bias toward doing over credentialing.
Served as Chief of Staff to Keith Rabois before becoming a VC → likely operates well in high-proximity, high-trust relationships with strong principals; comfortable in a translator/executor role.
Co-founded Varda Space while holding a Principal seat at Founders Fund → carries a genuine operator instinct into every investment conversation, not just a pattern-matching lens.
Runs the Operators podcast specifically spotlighting non-CEO, non-VC operators → suggests he values the execution layer and will engage seriously with operators, not just founders or investors.
Role classified as 'hybrid' (VC + active founder) → probably impatient with purely theoretical investor conversations; responds better to concrete operational questions.
Promoted from Principal to Partner at Founders Fund in June 2023, suggesting a deliberate multi-year arc at the firm → not a job-hopper at this stage; thinks in longer cycles than most early-career operators.

Conversation tips

→ Reference a specific Operators podcast episode or Substack post — he created that platform deliberately and will notice if you've actually engaged with it vs. name-dropped it.
→ Ask about Varda specifically: the pharmaceutical-in-microgravity thesis is unusual enough that he's probably used to shallow questions about it — go one level deeper (regulatory re-entry, drug formulation advantages, customer profile).
→ He's been in both seats — operator and investor — so don't pitch him as one or the other; he'll engage most if you treat it as a conversation between two people who've both built things.
→ He dropped out of MIT and did YC — credentialism won't land; what you've shipped or decided matters more than where you studied.
→ If you want to discuss Founders Fund's portfolio thesis, come with a specific view on defense tech or space manufacturing rather than a generic 'AI is eating the world' framing — that's table stakes at this firm.

Toolbox

Openers

Open on Varda Space hitting unicorn status in 2025 after raising $187 million — ask what the path from 'pharmaceuticals in microgravity' thesis to actual re-entry capsules taught him about conviction versus market timing.
Reference his Operators Substack/podcast at delian.substack.com — he built it specifically to spotlight non-CEO operators, which is an unusual editorial bet from a VC; it signals something deliberate about what he thinks gets undervalued.
Lead with the Hill and Valley Forum — he created a forum sitting at the tech-policy intersection, which is a notable side-build from someone who also runs capital at a firm deploying billions into defense tech.

Discovery questions

Varda is manufacturing pharmaceuticals in microgravity — who actually buys that output today, and how did you think about validating demand before you had a re-entry vehicle?
You ran the Operators podcast specifically to interview people who aren't founders or VCs — what have you learned from that project that's changed how you evaluate companies at Founders Fund?
You were Chief of Staff to Keith Rabois before making the jump to investor — what did that role teach you about how the best investors actually make decisions versus how they describe making decisions?

Avoid

Don't open with generic questions about 'the future of space' or 'what's exciting in VC right now' — he's spent years building a specific thesis around microgravity manufacturing and defense tech, and vague horizon-scanning questions will signal you haven't done the work.

Make it yours