Aileen Lee

Cowboy Ventures’ official profile page lists Aileen Lee as Founder & Managing Partner and describes her as working with startup teams at the very earliest stages in enterprise and consumer. The page describes her seed investing experience as spanning more than two decades.⁠[1]

In the firm’s 10-year anniversary retrospective, Aileen wrote that fundraising for Cowboy Fund I began in 2012 and that 2012–2013 was the first full year of the business; “Cowboy” was originally just a placeholder name in the fundraising deck, taken from a family nickname her daughter gave her son, and was later kept as the official brand.⁠[2]

In July 2012, Aileen launched Cowboy Ventures, an independent seed fund, out of Kleiner Perkins, with a target size of $40 million; about $36 million had closed at the time, with KPCB as anchor investor. These figures are a contemporary snapshot taken during fundraising.⁠[3]

Before Cowboy, Aileen worked at Kleiner Perkins Caufield & Byers for more than a decade, taking part in the growth of companies including Bloom EnergyBloom EnergyBloom Energy is a New York Stock Exchange–listed company (ticker BE) headquartered in San Jose, California, United States, that designs and manufactures solid oxide fuel cell power generation systems and electrolyzers for on-site power at data centers, manufacturing facilities, and other sites. The company was founded in 2001 as Ion America, is led by KR Sridhar, and went public in 2018; its quarterly revenue exceeded $1 billion for the first time in the second quarter of 2026.Open the full entry, Rent the Runway, and Trendyol from Series A to IPO or acquisition; during that time she also served as founding CEO of RMG Networks, a KPCB-backed company.⁠[1]

Before entering venture capital, Aileen held an operating role at Gap Inc.Gap Inc.Gap Inc. is an apparel retailer headquartered in San Francisco, California, United States, whose brands include Old Navy, Gap, Banana Republic and Athleta, selling clothing, accessories and lifestyle products through company-operated and franchise stores and e-commerce sites. It grew out of the first Gap store, opened in San Francisco in 1969 by Donald G. Fisher and Doris F. Fisher, and its shares trade on the New York Stock Exchange under the symbol GAP.Open the full entry, and she began her career at Morgan StanleyMorgan StanleyMorgan Stanley is an American global financial services firm that grew from an investment banking partnership into a publicly traded financial group spanning investment banking, securities trading, wealth management, and investment management.Open the full entry. The public bio does not list complete start and end dates for these positions.⁠[1]

While managing the newly formed $40 million Cowboy fund, Aileen studied billion-dollar startups from the previous decade and on that basis used “unicorn” to describe such rare, highly valued companies. She published her findings in 2013, and the term then entered the common vocabulary of the startup and investment industries.⁠[4]

In 2023, Cowboy announced two new funds totaling $260 million: the $140 million Cowboy Fund IV for seed investments and the $120 million Mustang Fund for follow-on investments in standout existing portfolio companies. The announcement stated that about 70% of past investments were made before product launch, with continued coverage of enterprise software, developer tools, security, fintech, AI, consumer, and healthcare.⁠[5]

Aileen holds degrees from MIT and Harvard Business School, and she is a co-founder of All Raise, a board member of Castilleja School, and a Henry Crown Fellow.⁠[1]

Harvard Business School’s official entrepreneurship alumni directory lists Aileen Lee as MBA 1997 and associates her with Cowboy Ventures and Kleiner Perkins.⁠[6]

Aileen’s official Cowboy profile page specifically states that she is not involved in any dedicated cryptocurrency fund or investment vehicle and advises reporting parties using her name to the authorities. The warning is meant to prevent same-name or fake crypto projects from being associated with her.⁠[1]