Helena Crevar was born in January 2007 in Las Vegas, Nevada, USA. From an early age, martial arts played a central role in her development, beginning Kajukenbo training at the age of three. Kajukenbo, a Hawaiian-originated combat system blending striking and grappling techniques, provided Crevar with a versatile foundation. Her rapid progression earned her a junior black belt by age eight. Alongside martial arts, Helena actively engaged in diverse athletic pursuits, including ballroom dance, ballet, basketball, and swimming. Demonstrating an early commitment to athletic excellence, she began structured strength and conditioning training at a local gym at eight years old, a decision that ultimately introduced her to Brazilian Jiu-Jitsu.

Initially training under various instructors, Helena Crevar eventually joined the renowned youth program led by Hector Vasquez. Recognizing her exceptional talent and dedication, Vasquez promoted her to blue belt. At age 15, Crevar relocated to Austin, Texas, to train under world-renowned grappling coach John Danaher. Under Danaher's meticulous guidance, she rapidly advanced through the ranks, earning her brown belt in December 2024 at just 17 years old, shortly after standout performances at the No-Gi Worlds and 2024 ADCC World Championship. In June 2025, Crevar reached a historic milestone, becoming the first female black belt promoted by John Danaher.

On April 18, 2025, at WNO 27, Helena Crevar made history by capturing the Who’s Number One 145 lbs title. Demonstrating tactical precision and aggressive submission hunting, she secured the championship by submitting accomplished competitor Elisabeth Clay via rear-naked choke. At only 18 years old, Crevar became the youngest WNO champion ever, solidifying her reputation as one of the sport's most promising talents.

Helena Crevar has established herself as a dominant competitor in Polaris Professional events, maintaining an undefeated 3–0 record. In 2024, she captured the Polaris Women's Lightweight (70 kg) title and successfully defended it twice, showcasing consistent technical superiority and strategic adaptability at the highest level. Recognizing her exceptional potential and marketability, Polaris signed Crevar to an exclusive contract, marking a significant advancement in her professional grappling career.

In May 2024, Crevar further demonstrated her competitive maturity and technical prowess by defeating France's top grappler, Aurélie Le Vern, at UFC Fight Pass Invitational 7. This victory against a seasoned black belt competitor underscored her advanced skill set and established her presence on the international grappling stage.

Versatility in Gi and No-Gi

Helena Crevar is recognized for her proficiency and adaptability in both gi and no-gi competitions. Her comprehensive grappling skill set allows her to seamlessly transition between formats, consistently performing at an elite level.

Aggressive Submission Strategy

Known for her aggressive, submission-oriented style, Crevar frequently employs the rear-naked choke as her preferred finishing technique. Her relentless pursuit of submissions places constant pressure on opponents, creating openings through strategic setups and positional dominance.

Technical Precision Under Danaher

Training under John Danaher at New Wave Jiu-Jitsu, Crevar embodies the systematic, detail-oriented approach characteristic of Danaher's renowned coaching methodology. Her game emphasizes technical precision, strategic execution, and methodical control, making her a formidable competitor and a model for aspiring grapplers.