Klaviyo CEOs Andrew Bialecki and Chano Fernández: Email, LinkedIn and Bio (2026)

Klaviyo’s co-CEOs at a glance

Klaviyo CEO email address: how to reach Andrew Bialecki and Chano Fernández

Neither co-CEO has published a personal email address: not on LinkedIn, X, Klaviyo’s blog or community, or in interviews (checked November 8, 2026). When Bialecki introduced himself to Klaviyo’s community in 2020, he wrote “Feel free to drop me a note to say hi”, without an address (Klaviyo Community). Klaviyo staff use {first}.{last}@klaviyo.com, such as maya.chen@klaviyo.com for a fictional Maya Chen: 63 of the 66 staff addresses in Klaviyo’s public code repositories follow it.

For press, Klaviyo’s inbox is press@klaviyo.com (Klaviyo). Bialecki names X and LinkedIn as the places to find him: “I’m @abialecki on Twitter, and I’m on LinkedIn” (Practical Ecommerce). And be wary of messages that claim to come from Klaviyo: Klaviyo says scammers fake its senders with addresses such as klaviyo-support@gmail.com, and that if a message asks you to sign in, you should type www.klaviyo.com into your browser instead of clicking (Klaviyo).

Klaviyo email address pattern

Klaviyo staff use {first}.{last}@klaviyo.com, such as maya.chen@klaviyo.com for a fictional Maya Chen: 63 of the 66 staff addresses in Klaviyo’s public code repositories follow it.

Before emailing any pattern-based address, run it through a verifier: a bounce hurts deliverability for every later send. All Klaviyo patterns and official inboxes are on the Klaviyo email format page.

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Career timeline

How Bialecki and Hallen started Klaviyo

Bialecki and Ed Hallen met as colleagues at Applied Predictive Technologies, an analytics firm in Washington, D.C. (TechCrunch). In 2012 they saw that consumer brands “were sitting on mountains of data but couldn’t use it to personalize experiences or drive revenue”, and started Klaviyo in Boston to fix that (Klaviyo). It began as a database for e-commerce data rather than an email tool, and the founders ran it without venture money for three years (TechCrunch). “Our first customer was a parking lot,” Bialecki has said (Agents of Scale).

“We figured, when it was just the two of us, we didn’t need titles like CEO,” Bialecki told TechCrunch; he formally became CEO in 2017 (TechCrunch), though Klaviyo’s filings date his CEO tenure from September 2012 (SEC). Hallen left in 2016 and returned in 2021, and is now chief strategy officer and a director (SEC).

Andrew Bialecki

Bialecki studied physics, astronomy and astrophysics at Harvard, graduating in 2007, then worked as a software engineer (Forbes): lead engineer at Applied Predictive Technologies, senior engineer at the marketing software company Performable, and CTO of RockTech (SEC). He has led Klaviyo since it was founded, chairs its board, and since 2026 focuses on “Klaviyo’s AI vision and building AI-first products” (Klaviyo).

He controls the company. As of April 15, 2026 he held 75.9 million Series B shares, 48% of the class and 44.1% of all votes, more than any other holder (SEC). He takes almost no pay: $78,000 in 2025, a $75,000 salary and no stock, which made his pay 0.42 times the median Klaviyo employee’s (SEC). Between August 2025 and May 2026 he sold about 5.6 million shares under a trading plan he set up in May 2025 (SEC).

Andrew Bialecki’s net worth

Forbes estimates Andrew Bialecki’s net worth at about $1.7 billion as of November 8, 2026 (Forbes). It rests on his Klaviyo stake: he owned 38% when the company went public in 2023 (Forbes), and still holds about a quarter of its shares by our count of the proxy figures. The figure tracks Klaviyo’s share price, which is why he ranked lower on Forbes’ 2026 billionaires list (No. 2,600) than in 2025 (No. 1,072) (Forbes). Co-founder Ed Hallen was worth about $1.2 billion on Forbes’ 2025 list (Forbes).

Chano Fernández

Fernández grew up in Cáceres, in western Spain (Boardwave), and studied physics at the University of Salamanca before an MBA at IE in Madrid (SEC). He worked at McKinsey and at SAP, where he ran innovation sales for Europe until 2013 (SEC), then joined Workday in 2014 and became its co-CEO alongside co-founder Aneel Bhusri in August 2020 (SEC). He left that role in December 2022 (SEC) and was co-CEO of the AI recruiting company Eightfold AI from January 2024 to August 2025 (SEC).

He joined Klaviyo’s board in July 2023 (SEC), stepped in as interim executive officer in September 2025 (SEC), and became co-CEO on January 1, 2026, in charge of “go-to-market, operations, and general & administrative functions” (Klaviyo). He is based in Europe and splits his time between London, San Francisco and Boston (Boston Globe).

His pay is mostly tied to the share price: a CHF 800,000 salary, a CHF 400,000 target bonus, $33 million of stock vesting over three years, and $36 million of performance stock that vests only if Klaviyo’s shares hold $40, $55, $70 or $85 for 60 days within five years (SEC). He hasn’t been given a public net-worth estimate.

In their own words

“We have a saying at Klaviyo: ‘We’re 1% done.’ With AI unlocking possibilities for B2C businesses that were unimaginable even a year ago, that mindset has never felt more true.”

— Andrew Bialecki, December 9, 2025 (Klaviyo)

“AI is taking barriers out of marketing, and as agents take on more of the work, they are only as good as the context behind them.”

— Andrew Bialecki, November 4, 2026 (SEC)

“We look at Klaviyo as a training ground for future entrepreneurs.”

— Andrew Bialecki, December 15, 2025 (Boston Globe)

“It forced this very customer first, you know, you have to know, you know your customers, you spend every day with them.”

— Andrew Bialecki, on bootstrapping Klaviyo, August 7, 2025 (Agents of Scale)

“This is a pivotal moment for our industry — AI is reshaping how brands understand and deepen relationships with their consumers.”

— Chano Fernández, December 9, 2025 (Klaviyo)

“He’s a builder at heart, and together we’ll push Klaviyo further than ever.”

— Chano Fernández, on Bialecki, December 9, 2025 (Klaviyo)

Klaviyo’s leadership

Full company profile, including revenue and funding: Klaviyo in 2026: revenue, valuation, funding, CEO.