Guistinna Tun is a third-year medical student at UCSF, where she is part of the PRIME-US program dedicated to serving urban underserved communities. Her interests lie at the intersection of vascular surgery, cardiovascular health, and immigrant health. Originally from El Monte, CA, she earned a bachelor’s degree in Psychobiology from UCLA. During her gap years, she interned with the Los Angeles County Office of Immigrant Affairs, supporting the rollout of mobile vaccine clinics and the citywide Language Access Plan. As a first-year medical student, she led the expansion of CHAMPIONS to the East Bay, coordinating screenings, training volunteers, and developing formal roles to engage undergraduate and medical students early in vascular surgery and its health equity mission. She now serves as the Medical Student Lead, helping guide the program’s expansion to institutions nationwide. Her research focuses on the impact of CHAMPIONS screenings on disease awareness and access to care in underserved communities, as well as the validation of pedal acceleration time as a non-invasive tool to assess perfusion in patients with chronic limb-threatening ischemia. On her days off, she enjoys long walks through the local garden center, debating whether she has room for more plants in her apartment, and sending photos of her flowers to her mom.