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Billionaire Profile
Andrew Bialecki
Global Rank
#1072

Image: Public domain | via Wikimedia Commons

Andrew Bialecki

CEO, Klaviyo
US
Real-Time Net Worth
$2.5B
As of December 2025
Age
40
Source
Marketing software
Industry
technology
Citizenship
US

Biography

Andrew Bialecki is the co-founder and CEO of Klaviyo, a marketing automation software company. With a current estimated net worth of $2.5 billion, he is a leading figure in the technology industry. Bialecki's source of wealth stems from his successful venture, Klaviyo. His career began with a background in Physics, Astronomy, and Astrophysics from Harvard University, where he earned a Bachelor's degree. Before founding Klaviyo in 2012, Bialecki gained experience in various technology roles, including Lead Engineer at Applied Predictive Technologies, Senior Engineer at Performable, and CTO at RockTech. Bialecki's achievements include leading Klaviyo to become a major player in the e-commerce space, with its tools for email and SMS marketing automation integrated with platforms like Shopify.

Wealth Over Time

In-Depth Profile

Early Life

Andrew Bialecki was born and raised in Massachusetts. He demonstrated an early aptitude for technology and business. He graduated from Harvard University in 2007 with a Bachelor of Arts degree in Physics, Astronomy, and Astrophysics.

Career

Before starting Klaviyo, Bialecki worked at Applied Predictive Technologies as a Lead Engineer (2007-2010), Performable as a Senior Engineer (2010-2011), and RockTech as a CTO (2011-2012). These experiences helped shape his vision for Klaviyo. In 2012, Bialecki co-founded Klaviyo with Ed Hallen. Their goal was to transform how businesses communicate with their customers, using data to drive personalized marketing strategies. Bialecki has served as CEO of Klaviyo since its founding.

Rise to Success

Under Bialecki's leadership, Klaviyo has grown from a startup into a major force in e-commerce marketing. The company provides tools for email and SMS marketing automation and integrates with platforms such as Shopify and BigCommerce. In 2023, Klaviyo went public, with its stock surging 23% on the first day of trading, propelling Bialecki into the billionaire ranks. As of December 2025, Klaviyo has a market cap of $19.75 billion.

Key Business Strategies

Bialecki and Hallen chose to bootstrap Klaviyo for the first three years after founding it, refusing venture capital until the company was profitable. This strategy allowed them to retain a significant ownership stake. Bialecki emphasizes sustainable growth, customer data, and long-term value creation.

Philanthropy

Specific philanthropy amounts are not available in the search results.

Career Milestones

2007

Lead Engineer

Began career at Applied Predictive Technologies.

2010

Senior Engineer

Senior Engineer at Performable.

2011

CTO

Chief Technology Officer at RockTech.

2012

Co-founded Klaviyo

Co-founded Klaviyo and became CEO.

Business Philosophy & Leadership

Leadership Principles

Focus on sustainable growth

Prioritizes long-term value over short-term gains.

Emphasis on customer data and insights

Uses data to drive personalized marketing strategies.

Commitment to building long-term value

Focuses on building sustainable products.