What Happened to Lia Catherine Thomas?

Lia Thomas, born in May 1999, began her swimming career on the men's team at the University of Pennsylvania in 2017. She came out as transgender to her family in the summer of 2018 and began hormone replacement therapy (HRT) in May 2019. During the 2019-2020 academic year, she competed on the men's team while undergoing HRT. After a gap year in 2020-2021 due to the COVID-19 pandemic, during which she continued HRT, Thomas became eligible to compete on the women's team under NCAA rules in effect at the time.

Her return to competitive swimming in the 2021-2022 season saw her achieve national prominence, setting school records and posting the fastest times in the nation in several events, including the 200-yard and 500-yard freestyle. This success culminated in her winning the NCAA Division I national championship in the 500-yard freestyle in March 2022, making her the first openly transgender athlete to achieve this feat. Her participation, however, ignited a fierce national and international debate regarding fairness and competitive balance in women's sports, with some arguing that she retained biological advantages from male puberty despite hormone therapy.

A key turning point occurred in June 2022 when the International Swimming Federation (FINA), now World Aquatics, voted to bar transgender athletes who had undergone any part of male puberty beyond Tanner Stage 2 (or age 12) from competing in elite women's competitions. This decision effectively rendered Thomas ineligible for future international events, including her stated goal of competing in the 2024 U.S. Olympic trials.

In January 2024, Thomas launched a legal challenge against the World Aquatics policy, arguing it was discriminatory. However, in June 2024, the Court of Arbitration for Sport (CAS) dismissed her case, ruling that she lacked standing to challenge the policy as she was not currently registered with USA Swimming or seeking to compete in World Aquatics events. This ruling effectively ended her hopes of competing in elite women's swimming. Thomas has not competed in any swim competitions since the 2022 NCAA championships.

The political and legal ramifications continued into 2025. In March 2025, the Trump administration withheld $175 million in federal funding from the University of Pennsylvania, citing alleged Title IX violations related to Thomas's participation. In July 2025, UPenn reached an agreement with the U.S. Education Department, publicly stating its compliance with the administration's interpretation of Title IX, which limited participation based on sex assigned at birth. As part of this resolution, the university updated its swimming records, modifying some of Thomas's achievements, while still acknowledging her records under the eligibility rules at the time, and agreed to apologize to female athletes who felt disadvantaged.

Most recently, in September 2026, a federal judge dismissed a lawsuit brought by former University of Kentucky swimmer Riley Gaines and other female athletes against the NCAA. The lawsuit claimed the NCAA violated Title IX by allowing transgender athletes like Thomas to compete in women's sports. The judge ruled that the NCAA is not covered by Title IX because it does not receive federal funding. Gaines has vowed to appeal this decision. Thomas has also engaged in transgender advocacy work, including a keynote speech at the Philly Trans Wellness Conference in September 2024.