Overview
Andrew Bialecki is Co-Founder, Co-Chief Executive Officer, and Chairperson of Klaviyo, per Klaviyo newsroom and blog materials announcing the co-CEO structure with Chano Fernández. He founded Klaviyo in 2012 with Ed Hallen.
Klaviyo is a major B2C customer data and marketing automation platform. The January 2026 co-CEO transition is the defining recent leadership fact in the verified record.
Role
Bialecki’s current title combines co-founder, co-CEO, and chairperson roles. Sharing the CEO office with Chano Fernández as of January 2026 changes day-to-day executive design while keeping Bialecki in chairperson governance.
Official source: Klaviyo newsroom co-CEO appointment. Supporting source: Klaviyo blog welcome post for Chano Fernández.
Background
Bialecki studied Physics and Astronomy at Harvard. Prior experience associated with RockTech, Performable, and APT appears in the verified fact list.
A physics and astronomy academic path into marketing automation founding is atypical and often cited as part of Klaviyo’s data-science-forward product culture, without inventing coursework details beyond the field of study.
Career
Verified career markers include RockTech, Performable, and APT associations; Harvard Physics/Astronomy study; co-founding Klaviyo with Ed Hallen in 2012; and the January 2026 co-CEO arrangement with Chano Fernández while serving as chairperson.
The Performable and APT markers place Bialecki in earlier generations of marketing and analytics software before Klaviyo’s B2C CRM scale-up.
Company Journey
Klaviyo’s journey under Bialecki starts with the 2012 founding with Ed Hallen and extends through category leadership in e-commerce marketing automation. The 2026 co-CEO appointment marks a deliberate professionalization of the CEO function rather than a full founder exit.
Co-CEO structures are uncommon in marketing SaaS and therefore important for researchers tracking governance experiments at scaled private or public growth companies.
Company-building arcs in this market are judged on whether an early product wedge survived scale, partner distribution, and category competition. Without adding undocumented milestones, it remains fair to note that buyers and researchers watch for consistency between founding thesis and current platform positioning on official company pages.
Leadership
Leadership now splits operating CEO responsibilities between Bialecki and Chano Fernández, with Bialecki also holding the chairperson role per Klaviyo announcements.
That design keeps founder product authority in the executive office while adding a co-CEO peer — a signal of scale-stage leadership redesign rather than founder departure.
Public leadership evaluation in this category usually turns on whether the founding executive remains the primary operator, whether co-leadership or board roles have been disclosed, and whether newsroom attributions match the biography title. Where official sources document a change, that change is part of the leadership story and should be read as an operating signal.
Public Milestones
2012: Klaviyo founded with Ed Hallen. Education: Harvard Physics/Astronomy. Prior: RockTech, Performable, APT. January 2026: Co-CEO with Chano Fernández; Bialecki remains chairperson.
No valuation or IPO claims beyond the verified set are included.
Why This Founder Matters
Bialecki matters because Klaviyo is a cornerstone B2C marketing platform and his co-CEO transition is a live case study in founder governance at scale.
Comparative readers should note the combination of technical academic background, early marketing-tech roles, 2012 founding, and 2026 co-CEO sharing — a fuller arc than title-only founder pages usually provide.
For researchers building comparative matrices of category leaders, the useful question is not whether a founder is well known, but whether the verified operating record explains how the company wins enterprise trust. Role continuity, disclosed transitions, and the specificity of official biography pages are stronger signals than secondary summaries. This profile is designed to support those comparisons without inventing personal detail.
Sources
Primary sourcing for this profile of Andrew Bialecki at Klaviyo is limited to the official company pages cited below, reviewed July 11, 2026.
- Klaviyo — official leadership or author page: https://www.klaviyo.com/newsroom/klaviyo-appoints-chano-fernandez-as-co-ceo
- Klaviyo — supporting company page: https://www.klaviyo.com/blog/welcome-chano-fernandez-co-ceo
No education, employer, funding, or personal claims beyond those stated in the verified facts and cited pages are included. Sector analysis in other sections is interpretive context about the market category, not additional biography.
Last Reviewed
This profile was last reviewed on July 11, 2026.
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