Lee Fixel is the Founder and Managing Partner of Addition, a firm that invests in founder-led, technology-enabled companies. Previously, Lee was a Partner at Tiger Global Management, where he was head of the firm’s private equity business.
In 2014, Lee and his wife founded the Lauren and Lee Fixel Family Foundation, which supports various educational and not-for-profit initiatives. In 2017, Lee also established the Norman Fixel Institute for Neurological Diseases at University of Florida Health, a clinical care and research institute focused on advancing diagnosis and treatment for Parkinson’s disease and other neurological disorders. In 2025, the foundation supported the launch of the Food and Agriculture Research Mission (FARM) at Washington University in St. Louis – an initiative to address challenges in agricultural production, food distribution and access to nutritious foods.
Fixel earned a B.S. in business administration, finance and accounting from Washington University in St. Louis and is a member of the Board of Directors of the WashU Investment Management Company.
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Addition
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Addition invests in early and growth-stage technology companies. The firm was founded with a mission to support visionary entrepreneurs on their journey to build impactful and enduring businesses.
