Ada Lio (born December 27, 1974) is an American professional pool player, instructor, and health equity professional. She competes on the Women's Professional Billiard Association (WPBA) tour and serves in leadership roles both within the sport and in advocacy and strategy work focused on health care accessibility. In 2025 she was ranked the 26th best female player by the WPBA. Outside of sports, she is the executive director of the ZTTK SON-Shine Foundation, a non-profit dedicated to researching ZTTK syndrome, and a Director of Strategy at CVS Health.
Ada Lio was born on December 27, 1974, in Jersey City, New Jersey, grew up in Jersey City and lives in Union City, New Jersey. She began playing pool recreationally while attending Rutgers University, where she first developed interest in competitive billiards.
She later earned a degree in economics from Harvard University and an MBA from The Wharton School at the University of Pennsylvania.
Lio began playing in organized leagues with the American Poolplayers Association (APA) in 2003, later competing in Billiards Congress of America (BCA) leagues and Tony Roblesâ National Amateur Pool League (NAPL). She expanded her competitive reach to include regional tour events like the TriâÂÂState Tour and Predator events before joining the WPBA touring roster in 2018.
Notable achievements include:
She has qualified for multiple US Amateur Championship Women's events and maintains an active presence on the WPBA and JPNEWT tours. Lio also instructs pool players and offers lessons emphasizing fundamentals and personalized improvement.
Outside of billiards, Lio works in health care strategy and corporate leadership. She serves as Director of Strategy at CVS Health, focusing on improving accessibility and affordability of health care products and services.
She also sits on the board of the ZTTK SONâÂÂShine Foundation, a nonprofit advancing treatments for children with ZTTK syndrome, leveraging her strategic expertise to promote health equity and support affected families.
Lio still has billiards ties to New Jersey, but as of 2025 lives in Somerville, Massachusetts with her husband, Nathan Guo, son, Lucas (Lukie), and dog Luna. Lucas has ZTTK. She actively participates in community initiatives and promotes health awareness alongside her professional and competitive pursuits.