Chance Hill and Mark "Oz" Geist

University of Colorado Regent Chance Hill, at left, meets with Marine veteran Mark "Oz" Geist. 

Tickets are on sale to hear Marine Corps veteran and author Mark “Oz” Geist recount his experiences in the Benghazi siege in 2012. He will appear next month at the University of Colorado at Colorado Springs.

Geist is expected to speak about “his life and leadership lessons,” organizers said, from 6 to 8 p.m. Oct. 9, in the Shockley-Zalabak Theater at the Ent Center for the Arts.

Tickets are $12 for adults and $7 for students and are available online at

Geist co-wrote “13 Hours: The Inside Account of What Really Happened in Benghazi,” the basis of the movie “13 Hours: The Secret Soldiers of Benghazi.”

The accuracy of Geist’s account has been challenged after the movie came out in 2016, particularly the key contention that the security team defied a stand-down order to save lives.

Then a law enforcement officer from Colorado Springs, Geist campaigned for Donald Trump and was a speaker at the 2016 Republican National Convention.

Geist was a member of the security team at the diplomatic outpost in Libya. The team was credited with helping save more than two dozen lives during the firefight that killed four Americans, including Ambassador Christopher Stevens.

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