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Andrew Bialecki.

This as-told-to essay is based on a conversation with Andrew Bialecki, the 40-year-old CEO of Klaviyo, based in Boston. It's been edited for length and clarity.

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Andrew Bialecki, CEO And Co-Founder Of Klaviyo
Andrew Bialecki, CEO And Co-Founder Of Klaviyo
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Klaviyo's founders, employees, and early customers celebrate the company's Wall Street debut on the New York Stock Exchange floor.
Klaviyo's founders, employees, and early customers celebrate the company's Wall Street debut on the New York Stock Exchange floor.