Mackenzie Dern
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Mackenzie Lynne Dern is an American professional mixed martial artist and Brazilian Jiu-Jitsu practitioner. She is a former world No. 1 ranked IBJJF competitor, currently ranked 6th among the female divisions. She is an ADCC and no gi BJJ (black belt) World Champion.

Dern was born in Arizona, the daughter of Wellington "Megaton" Dias, a highly decorated grappling competitor himself. As a child she grew up travelling back and forth between Arizona and her father's native Brazil. Dern is fluent in both her native English and Portuguese. She has stated that Portuguese has become her primary tongue, explaining that "my Dad and step Mom are both Brazilian. My boyfriend speaks Portuguese. I'm speaking Portuguese more than English. I still have lots of interactions in English of course. But I think in Portuguese, anything to do with fight is all in Portuguese in my mind, I dream in Portuguese."