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Sami Tantawi

Sami Tantawi

Co-founder and chief technology officer of TibaRay, which is developing FLASH radiotherapy technology.

ExecutiveDirector
Updated Nov 6, 2026·Latest SEC filing Nov 3, 2026·Suggest an edit

About Sami Tantawi

Sami Tantawi is co-founder and chief technology officer of TibaRay, which is developing FLASH radiotherapy technology. He also teaches physics as a professor at Arizona State University, and holds an emeritus faculty title in astrophysics and particle physics at Stanford University and at SLAC National Accelerator Laboratory.

At SLAC, he earlier served as chief scientist in the Technology & Innovation Directorate, where he directed work on RF accelerator and radiation source technology. He is also a member of TibaRay's board of directors.

Experience

This experience comes from official bios and from SEC filings. For roles taken from filings, the years are when the filings name Sami Tantawi in the role, so the role may have started earlier or lasted longer.

Tibaray, Inc. Current
Co-Founder, CTO & Member, Board of Directors
2026 – Present · Fremont, CA
TibaRay's Galactica linear accelerator is designed to deliver a full radiotherapy dose in a fraction of a second while sparing healthy tissue.
Arizona State University Current
Professor of Physics
Stanford University Current
Emeritus Professor of Astrophysics and Particle Physics
SLAC National Accelerator Laboratory Current
Emeritus Professor of Astrophysics and Particle Physics
Chief Scientist in the Technology & Innovation Directorate

Key Colleagues at Startups

The people Sami Tantawi works with at each company, as listed on that company's latest Form D.

Tibaray, Inc. · Form D, Nov 3, 2026
Thinh Tran
Thinh Tran
CEO, Member, Board of Directors
Laird Cagan
Laird Cagan
Member, Board of Directors
Peter Maxim
Peter Maxim
Co-Founder & Member, Board of Directors
James Vetter
James Vetter
Member, Board of Directors
Billy Loo
Billy Loo
Director

Sources

  1. SECTibaray, Inc. Form D, filed Nov 3, 2026