About Thomas Seifert
Thomas Seifert has been chief financial officer of Cloudflare since 2017 and chairs the audit committee of Crusoe's board, which he joined in September 2026. He was earlier CFO of Symantec, Brightstar and AMD, where he also briefly served as interim CEO.
Experience
This experience comes from official bios and from SEC filings. For roles taken from filings, the years are when the filings name Thomas Seifert in the role, so the role may have started earlier or lasted longer.
CL
Cloudflare Current
Chief Financial Officer
2017 – Present
Crusoe Inc.
Director
2026 · Denver, CO
Crusoe secures power, builds and runs AI data centers, and rents GPU cloud computing to AI labs and large companies.
SY
Symantec
Chief Financial Officer
AA
Advanced Micro Devices (AMD)
Chief Financial Officer
Interim Chief Executive Officer
BR
Brightstar
Chief Financial Officer
Education
- MBA, Friedrich-Alexander University
- Bachelor's, Economics and Business Administration, Friedrich-Alexander University
- M.A., Economics, Wayne State University
Key Colleagues at Startups
The people Thomas Seifert works with at each company, as listed on that company's latest Form D.
Crusoe Inc. · Form D, Sep 17, 2026
CL
Chase Lochmiller
Executive officer and director
MG
Michael Gordon
Chief Operating Officer and Chief Financial Officer
VP
Vivek Pattipati
Director
JS
JB Straubel
Director
BS
Bill Stein
Director
ES
Enrique Salem
Director
NK
Nael Kassar
Director
CC
Cully Cavness
Co-founder, President and Chief Strategy Officer, director