Leandro Vieira

Leandro Vieira stands as a co-founder of Checkmat, one of the most prominent and globally recognized Brazilian jiu-jitsu affiliations in the world. Alongside Leo Vieira, he served as one of the organization's original architects, playing a central role in establishing Checkmat's identity, structure, and international reach. Under their leadership, Checkmat expanded into a large and influential team with academies and affiliated schools spanning multiple continents, producing world-class competitors across all levels of the sport.

On February 4, 2026, Checkmat suspended Leandro Vieira from all affiliation — a significant governance action directed at one of the organization's own co-founders. The board had previously taken an interim step of removing him from any leadership role while permitting limited affiliation pending resolution of an ongoing civil proceeding, before ultimately voting to suspend him entirely. On February 5, 2026, Leo Vieira confirmed that Leandro remains suspended pending a judicial decision.

Beyond his organizational role at Checkmat, Leandro Vieira built one of the most distinguished coaching records in mixed martial arts history as the Brazilian jiu-jitsu coach at American Kickboxing Academy (AKA) — widely regarded as one of the most decorated MMA training facilities in the world.

The caliber of athletes who developed their grappling under Vieira's instruction is exceptional by any measure. Daniel Cormier, a two-division UFC champion who held titles simultaneously at light heavyweight and heavyweight, trained his BJJ under Vieira's guidance. Khabib Nurmagomedov, the undefeated former UFC Lightweight Champion widely regarded as one of the greatest grapplers in MMA history, worked directly with Vieira at AKA. Islam Makhachev, who succeeded Khabib as UFC Lightweight Champion and has continued to dominate the division, also trained under Vieira's BJJ instruction during his time at the facility. Completing this remarkable roster, Vieira worked with Luke Rockhold, the former UFC Middleweight Champion, and Cain Velasquez, the two-time UFC Heavyweight Champion.

The simultaneous presence of multiple world champions among his students established Vieira as one of the most impactful BJJ coaches in the sport's history. After departing AKA, he continued coaching at the highest levels, working with UFC bantamweight contender Marlon Vera.

Julia Angelica's Public Account

On February 3, 2026, BJJ brown belt Julia Angelica publicly alleged a pattern of inappropriate behavior by Leandro Vieira spanning more than a decade. Angelica stated that she had known Vieira since childhood and regarded him as a second father figure — a dynamic she says made the alleged conduct particularly damaging and difficult to confront.

According to her account, the alleged conduct began when she was a minor competing at her first Pan American championship as a juvenile competitor. She alleges Vieira made unwanted advances on the first night of the trip, which she rejected, and that the behavior continued the following night. The years that followed, she describes, involved a coercive relationship that persisted into adulthood, eventually ending before she relocated to Southern California, having previously moved to Long Beach to continue her training. After later returning to the Bay Area and seeking support, Angelica says Vieira offered her training and teaching opportunities before removing her from his facility — citing that past circumstances were affecting his relationship. She described feeling "sick, confused, and broken all over again."

Prior Disclosure and Organizational Response

As part of her public disclosure, Angelica made available a detailed four-page email she says she sent to Checkmat leadership approximately two years prior — specifically before February 5, 2024 — outlining the alleged relationship beginning at her first Pan American tournament. The response she received was minimal: a brief acknowledgment thanking her for her feedback, and a separate message from Vieira stating he had not read the full email because he was traveling, inviting her to an in-person conversation to address what he characterized as misunderstandings. Angelica states that no meaningful organizational action followed.

She also claimed that three Checkmat black belts were made aware of the alleged conduct and remained on the team, though those individuals are not named in available reporting. Angelica additionally referenced an earlier incident from approximately 2021 involving a person identified only as "Alyssa," with no further details available in public reporting. She criticized Checkmat for acting only after her account became public, questioning why no action was taken following her email in early 2024 or when a civil legal proceeding began around early 2025. She also stated that Checkmat blocked her from accessing the team's Instagram account.

Checkmat's Governance Position

Checkmat's organizational response offered a different characterization of the timeline. The board stated that when allegations were first brought to the organization — at an unspecified date — it removed Vieira from any leadership role while permitting limited affiliation pending resolution of the civil proceeding. The board subsequently voted to suspend him from all Checkmat affiliation. Checkmat explicitly characterized the suspension as an administrative governance decision to uphold organizational standards, stating that it was not a finding of fact and not a response to public commentary. In his February 5, 2026 statement, Leo Vieira confirmed that Leandro remains suspended pending a judicial decision, referring to him by the honorific "Professor Leandro" — a customary title for BJJ black belts.

All allegations described above reflect Julia Angelica's account as publicly stated. Checkmat's statements and Angelica's account present differing characterizations of the organization's timeline and responsiveness, and no judicial finding has been reported as of the dates of available reporting.