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Sean Brownlee

Venture Partner

With over 25 years of experience across operations, investing, and board leadership, Sean has worked closely with founders to build and scale multiple globally successful companies, including businesses that have gone public or been acquired. His background spans both early-stage company building and later-stage governance, giving him a well-rounded perspective on growth, execution, and long-term value creation.


At Defined, Sean partners with entrepreneurs on strategy, operations, and leadership as companies navigate critical inflection points. He brings deep experience as a board member and advisor, supporting teams as they scale responsibly and build durable, category-defining businesses. Sean is a CFA and a trusted partner to founders and fellow investors alike.

Let’s map
the unknown together

For founders

Tell us what you’re building.


We're the first believers in ideas that reshape systems

For investors

Request LP Info.
Learn how we invest at the frontier

of Data and AI

Let’s map
the unknown together

For founders

Tell us what you’re building.


We're the first believers in ideas that reshape systems

For investors

Request LP Info.
Learn how we invest at the frontier

of Data and AI

Let’s map
the unknown together

For founders

Tell us what you’re building.


We're the first believers in ideas that reshape systems

For investors

Request LP Info.
Learn how we invest at the frontier

of Data and AI

Let’s map
the unknown together

For founders

Tell us what you’re building.


We're the first believers in ideas that reshape systems

For investors

Request LP Info.
Learn how we invest at the frontier

of Data and AI