Jack Altman

Jack Altman is an American businessman, entrepreneur, author, and venture capitalist. He is a general partner with the venture capital firm, Benchmark. Previously, he was the founder and managing partner of Alt Capital, and Hydrazine Capital with his brother Sam. Until 2023, he served as CEO of Lattice, a human resources software company he co-founded.

Early life Altman grew up in a suburb of St. Louis, Missouri, in a Jewish American family, alongside Sam Altman. Through high school, he played water polo and participated in the rocketry club. where he earned a bachelor of arts degree studying economics.

Lattice In 2015, Altman co-founded Lattice, a human resources software company, with Eric Koslow.

Venture capital Following Altman's departure from Lattice, he founded the firm Alt Capital, where he was a solo partner,

In September 2025, a $275 million fund was created through the firm, titled Alt Capital II. Their brother, Max Altman, worked as an investor for Alt Capital. Owner.com, a business backed by Alt Capital saw growth from a $200 million valuation in 2024 to $1 billion in 2025. Legora, a legal AI startup, grew to a $675 million valuation less than a year after Alt Capital participated in its Series A round. Other partners in Alt Capital joined Benchmark in unspecified roles.

Other activities In 2020, Jack Altman served as an advisor for Apollo, a moonshot investment firm led by Sam Altman.

In 2021, Altman authored the book People Strategy: How to Invest In People and Make Culture Your Competitive Advantage, which became a Wall Street Journal best seller.

Altman hosts the podcast, Uncapped with Jack Altman, where he has interviewed guests like Sequoia Capital partners Alfred Lin and Pat Grady, and founder of Khosla Ventures, Vinod Khosla, and other entrepreneurs and investors.