Aileen Lee

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Aileen Lee – Life, Career, and Impact in Venture Capital


Explore the life and work of Aileen Lee — founder of Cowboy Ventures, originator of the term “unicorn,” advocate for women in tech — and learn from her journey, philosophy, and influence.

Introduction

Aileen Lee (born 1970) is an American venture capitalist, angel investor, and founder of Cowboy Ventures. She is widely known for coining the term “unicorn” to describe privately held startups valued at over $1 billion.

In this article, we trace her background, major achievements, influence, philosophy, and lessons we can learn from her path.

Early Life, Education & Background

Aileen Lee was born in New York City in 1970. Millburn, New Jersey, and graduated from Millburn High School in 1988, where she was senior class president.

She earned her bachelor’s degree from MIT Sloan School of Management in 1992. Morgan Stanley for two years. MBA from Harvard Business School, completing it in 1997.

Her educational background in management and finance laid a strong foundation for her later work in venture capital and startup investing.

Career and Achievements

At Kleiner Perkins

In 1999, Lee joined Kleiner Perkins Caufield & Byers (KPCB), one of Silicon Valley’s leading venture capital firms. Rent the Runway, Bloom Energy, and others.

While at Kleiner Perkins, she also served as founding CEO of RMG Networks, a digital out-of-home media company backed by KPCB.

Founding Cowboy Ventures

In 2012, Lee made the bold move to leave KPCB and launch her own seed-stage fund, Cowboy Ventures.

Cowboy Ventures invests in early-stage startups, typically at seed or pre-seed stages, often with initial investments between $100,000 and $1 million.

Some notable investments from Cowboy include Dollar Shave Club (which was later sold to Unilever), Product Hunt, Guild Education, Chime, Mutiny, and others.

Coining “Unicorn”

One of Lee’s most lasting impacts on tech culture was her coining of the term “unicorn” in a 2013 TechCrunch article titled “Welcome to the Unicorn Club: Learning from Billion-Dollar Startups.”

Lee later admitted she experimented with terms like “megahit,” “home run,” “Godzilla,” before “unicorn” felt right.

Advocacy & All Raise

Beyond investing, Lee is an advocate for improving representation in venture capital and technology. In 2018, she co-founded All Raise, a nonprofit aimed at increasing funding for female investors and helping women and nonbinary founders succeed.

Through All Raise, she and other leaders in tech have pushed for transparency in funding, mentorship, and systemic change to reduce bias in startup funding.

Her efforts in equity and inclusion also earned her recognition — she was named one of Time 100 Most Influential People in 2019.

Recognition & Influence

Lee has appeared on Forbes’ Midas List multiple times, as one of the most powerful women investors.

Her influence goes beyond deals — her writing, mentoring, and public commentary on founder experience, venture culture, and equity have shaped many in the startup ecosystem.

Personality, Philosophy & Approach

From interviews and public statements, some recurring traits, philosophies, and approaches emerge:

  • Founder support mindset: At Cowboy, Lee doesn’t just write checks — she helps founders with hiring, product strategy, pitch decks, financial planning, and troubleshooting during tough periods. She emphasizes being a partner rather than an overlord.

  • Collaborative approach: She values co-investing, partnership with other VCs, and sharing knowledge rather than siloed secrecy.

  • Risk-taking and conviction: Leaving a stable position at Kleiner to start her own fund was risky, but driven by conviction that early-stage seed investing needed more support.

  • Advocacy for diversity: She actively works to correct gender and racial imbalances in VC, mentoring and pushing for systemic change.

  • Writing and thought leadership: She continues to produce essays, blog posts, and commentary on startup trends and the challenges founders face.

Her public presence is often candid and accessible — she mixes insights, personal anecdotes, and reflections on challenges and uncertainties.

Selected Quotes

Here are a few notable statements and reflections attributed to Aileen Lee:

  • On leaving Kleiner Perkins: “It was scary … I was wondering after leaving, ‘Would anyone still talk to me?’”

  • On her term “unicorn”: Lee has said she tried various metaphors before settling on “unicorn,” and didn’t initially predict how widely the term would spread.

  • On founders: She emphasizes that in early startup phases, “sticking by people through hard times” is a source of pride in her role as an investor.

Though she does not produce many short ‘quoteables’ in public collections, her interviews and essays contain many more reflections on risk, equity, and startup challenges.

Lessons from Aileen Lee’s Journey

From Aileen Lee’s life and career, we can draw a number of actionable lessons:

  1. Be willing to leave safety for mission
    Lee’s decision to exit a prestigious VC firm to start her own seed fund shows that progress often requires risk and faith in one’s vision.

  2. Support founders holistically
    Investment is not just capital — mentorship, operational help, emotional support, and accountability matter, especially in early stages.

  3. Language shapes culture
    Coining the term “unicorn” reminded us how powerful metaphors are in shaping how industries think about success and rarity.

  4. Advocate from within
    Building a fund and investing are powerful means to push for diversity, not just through external activism but by changing who gets funded.

  5. Build with humility and collaboration
    Lee’s emphasis on co-investing and sharing insights reflects the idea that startup ecosystems grow best when players support each other rather than compete info isolation.

  6. Sustain endurance over hype
    Her focus on backing many companies, accepting that many will fail, while supporting those that keep going is a realistic mindset in venture.

Conclusion

Aileen Lee is a trailblazing figure in venture capital: a founder of her own fund, an originator of influential startup terminology, and a persistent advocate for equity in tech. Her path—from analyst to Kleiner Perkins partner to leading seed-stage investor—illustrates the possibilities of combining intellectual rigor, empathy, and conviction.

Her ideas, investments, and advocacy continue to shape how founders, investors, and ecosystems evolve — especially in areas of gender, inclusion, and early-stage startup dynamics.