Co-founder and co-CEO, Klaviyo
Andrew Bialecki is a co-founder and co-chief executive of Klaviyo, the Boston-based marketing and customer data platform; Klaviyo’s August 2026 results release quotes him as co-CEO. Klaviyo’s site says he founded it with Ed Hallen.
Career facts from the sources
- Wikipedia says Bialecki and Hallen had both worked at Applied Predictive Technologies before launching Klaviyo.
- In August 2022, Shopify invested $100 million in Klaviyo and named it the recommended email solution for Shopify Plus, according to the same source.
- Klaviyo listed on the New York Stock Exchange as KVYO in September 2023. Wikipedia reports that Bialecki holds about 38% of the company.
Sources disagree on the year Klaviyo was founded (its own site says 2012; Wikipedia says 2013).