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Jack Altman

Jack Altman is an American entrepreneur and venture capitalist known as the co-founder of Lattice, a human resources software company, and the founder of Alt Capital, an early-stage venture firm.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 27, 2026|2 min read| Fact-checked

Jack Altman is an American entrepreneur and venture capitalist known as the co-founder of Lattice, a human resources software company, and the founder of Alt Capital, an early-stage venture firm. He has also served as a general partner at Benchmark since 2026 and is the brother of entrepreneur Sam Altman.

Early life and education

Jack Altman studied economics at Princeton University, where he earned his bachelor's degree. Public biographical profiles identify him as an American entrepreneur and investor.

Lattice

Altman co-founded Lattice in 2015 and served as chief executive officer until 2024. The company builds people management software for organizations, and he later remained involved as chairman.

Venture investing

Altman is the founder and managing partner of Alt Capital, a seed-stage venture firm. He had previously invested at Hydrazine Capital and later became a general partner at Benchmark in 2026.

Other work

Before starting Lattice, Altman was vice president of business development at Teespring. He is also the author of the book People Strategy.

Key facts

  • Co-founded Lattice in 2015 and served as its CEO until January 2024.
  • Lattice is a people management and HR software platform for businesses.
  • After leaving the CEO role, he continued as chairman of Lattice and focused on investing.
  • He founded Alt Capital, a seed-stage venture firm, and joined Benchmark as a general partner in February 2026.
  • He studied economics at Princeton University.

Frequently asked questions

Who is Jack Altman?
Jack Altman is an American entrepreneur and venture capitalist best known for co-founding Lattice and founding Alt Capital.
What is Lattice?
Lattice is a people management and HR software company co-founded by Jack Altman.
When did Jack Altman leave the CEO role at Lattice?
He served as CEO of Lattice until 2024.
What is Alt Capital?
Alt Capital is Jack Altman’s early-stage venture capital firm.
What did Jack Altman study?
He earned an A.B. in economics from Princeton University.
Is Jack Altman related to Sam Altman?
Yes. Jack Altman is Sam Altman’s brother.

References

  1. Wikipedia — https://en.wikipedia.org/wiki/Jack_Altman_(investor)
    Supports: Biographical overview, Lattice co-founding, Alt Capital, and role as Benchmark general partner.
  2. LinkedIn — https://www.linkedin.com/in/jackealtman
    Supports: Employment history including Benchmark, Alt Capital, Lattice, Teespring, Hydrazine Capital, and Princeton education.
  3. Princeton Entrepreneurs Network — https://entrepreneurs.princeton.edu/people/jack-altman-11
    Supports: Lattice co-founder role, Princeton education, and prior work at Teespring.
  4. Pilot — https://founder-tactics.pilot.com/speakers/jack-altman
    Supports: Alt Capital, Lattice, Princeton degree, and authorship of People Strategy.