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Brigid O'Brien

Managing Partner, Planetary Health atRA Capital ManagementBoston, MA
RA Capital Management websiteFirm profile

Brigid O'Brien is a Managing Partner at RA Capital Management. She previously held investment leadership roles at BHP Ventures and In-Q-Tel.

What Brigid can write

Writes checks of$3M to $30M+
Comes in atPre-seed, Seed, Series A, Series BCan lead the round
Ownership target7-10%At first check
Pitch pageSubmit on their siteThe firm asks founders to apply here.

RA Capital Management writes $3M to $30M+ checks, larger than 93% of firms in the atlas.

Bars: how many firms report each check band. Highlighted: RA Capital Management.

Career

  1. In-Q-Tel · Managing Director
  2. BHP Ventures · Head of Venture Investments
  3. RA Capital Management · Managing Partner
    Now

Companies founded

IQT’s Australian subsidiary

Focus

climate changeenvironmental sustainabilitydecarbonizationresource extractionplanetary health

Education

Commonwealth Honors College at the University of Massachusetts Amherst, BS in ChemistryJohns Hopkins University, PhD in Materials Science and Engineering

Also at RA Capital Management

Adam Kaye
Adam KayeSenior Managing Director and Partner, Structured Capital
Emily Minkow
Emily MinkowManaging Director, Venture
Kyle Teamey
Kyle TeameyManaging Partner, Planetary Health
Laura Tadvalkar
Laura TadvalkarManaging Director, Venture
Nandita Shangari
Nandita ShangariManaging Director, Venture
Peter Kolchinsky
Peter KolchinskyManaging Partner
Rajeev Shah
Rajeev ShahManaging Partner
Tess Cameron
Tess CameronManaging Director, Venture

Partners like Brigid

At firms with a similar stage, sector and check size.

Ali Tamaseb
Ali TamasebGeneral Partner, DCVC
Colin Greenspon
Colin GreensponCo-Founder, Narya Capital
Po BronsonGeneral Partner & Managing Director, SOSV SF, SOSV SF & NY (Fka IndieBio)
David FriedbergCEO and Partner, The Production Board (TPB)
Pete Bastien
Pete BastienPresident & Partner, Hitachi Ventures
Andrew Beebe
Andrew BeebeManaging Director, Obvious Ventures

Alert me when RA Capital Management is active

One email when Brigid's firm raises a fund, adds a partner or shows new activity.

Founders and investors at a Mode VC gathering

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Raising a pre-seed or seed round? We write $1M to $5M first checks and help founders with distribution. A partner reads every deck.

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Questions

Who is Brigid O'Brien?

Brigid O'Brien is a Managing Partner at RA Capital Management. She previously held investment leadership roles at BHP Ventures and In-Q-Tel.

How much does Brigid O'Brien invest?

Brigid O'Brien invests through RA Capital Management, which writes checks of $3M to $30M+ at pre-seed, seed, series a, series b.

How do I pitch Brigid O'Brien?

A warm intro from a founder RA Capital Management backed works best.

What did Brigid O'Brien do before RA Capital Management?

Managing Director at In-Q-Tel; Head of Venture Investments at BHP Ventures.

Last updated 2026-10-15. Is this you? Ask for a correction.