Jason Herzog
Professional MMA referee — 1,574 bouts officiated on record.
1,574
Bouts
498
KO/TKO
386
Submission
656
Decision
Finish rate (of decided bouts)
57 %
Where they've officiated
Recent bouts officiated
Alessandro Costa vs
Cody Durden
2026-07-11
UFC 329 - McGregor vs. Holloway 2 · Submission (Rear-Naked Choke)
Brandon Royval vs
Lone'er Kavanagh
2026-07-11
UFC 329 - McGregor vs. Holloway 2 · Submission (Rear-Naked Choke)
Cobey Fehr vs
Daniel Bzdigian
2026-06-27
Professional Fighters League - PFL San Diego: McKee vs. Isbulaev · Submission (Brabo Choke)
Liz Carmouche vs
Viviane Araujo
2026-06-27
Professional Fighters League - PFL San Diego: McKee vs. Isbulaev · Submission (Guillotine Choke)
Bo Nickal vs
Kyle Daukaus
2026-06-14
UFC White House - Freedom 250: Topuria vs. Gaethje · TKO (Punches and Elbows)
Sean O'Malley vs
Aiemann Zahabi
2026-06-14
UFC White House - Freedom 250: Topuria vs. Gaethje · TKO (Punches)
Chelsea Chandler vs
Priscila Cachoeira
2026-06-06
UFC Fight Night 278 - Muhammad vs. Bonfim · Submission (Armbar)
Marcus McGhee vs
John Yannis
2026-06-06
UFC Fight Night 278 - Muhammad vs. Bonfim · Decision (Unanimous)
Cody Haddon vs
Qileng Aori
2026-05-30
UFC Fight Night 277 - Song vs. Figueiredo · TKO (Knees to the Body and Punches)
Jake Matthews vs
Carlston Harris
2026-05-30
UFC Fight Night 277 - Song vs. Figueiredo · Decision (Unanimous)
Yadong Song vs
Deiveson Figueiredo
2026-05-30
UFC Fight Night 277 - Song vs. Figueiredo · Submission (Guillotine Choke)