Dr. Guillermo Higinio Gil-Montero, a respected urologist and leader in medical outreach, died on April 18, 2026, at his home surrounded by family. He was 88 and had been diagnosed with bladder cancer.

Born on January 30, 1938, in Córdoba, Argentina, Dr. Gil-Montero completed his undergraduate and medical education at Universidad Nacional de Córdoba. He earned his Doctorate in Medicine from the Medizinische Akademie in Düsseldorf, Germany, before moving to the United States for further training. He completed his surgical internship and urological residency at Washington Hospital Center and served at the Armed Forces Institute of Pathology.

After his training, Dr. Gil-Montero returned to Argentina to serve as Chief of Pediatric Urology at Hospital de Niños in Córdoba. In 1972, he established a private urology practice in Manassas, Virginia, where he provided care until retiring in 2005.

Throughout his career, Dr. Gil-Montero made significant contributions to urology, focusing particularly on treatment methods for high-risk and localized prostate cancer. He held leadership roles in the medical community, serving as President of the Prince William County Medical Society and as President of the Medical Staff at Prince William Hospital during the early 1980s.

Beyond his clinical and administrative work, Dr. Gil-Montero was deeply involved in international medical missions. In the late 1990s and early 2000s, he led multiple outreach trips to underserved areas in the Dominican Republic and Haiti, and later to northern Argentina following the economic crisis there in 2001. His colleagues in the Dominican Republic honored him with the nickname “The Hero of the Mountains” for his dedication to emergency surgeries and efforts to improve public health, including administering tens of thousands of pediatric vaccinations and securing critical supplies for resource-limited clinics.

In reflecting on his service, Dr. Gil-Montero recounted a moment after performing complex surgery when a grateful patient expressed her appreciation by saying, “I love you,” in English. This exemplified the connection and impact he sought through his humanitarian work.

Outside of medicine, Dr. Gil-Montero pursued a variety of interests. He enjoyed playing classical guitar, working with his hands, traveling, and was known for riding his motorcycle well into his seventies. He was also an avid golfer.

Dr. Gil-Montero is survived by his wife, Gay Lynn, of Gainesville; his sisters, Martha and Beatriz; four children—Alejandra, Carolina, Federico, and Michelle; and grandchildren Jack Jr., Robert, Liam, Julia, Michael, Annika, and Cid. He also leaves behind an extended family in Argentina. A private memorial service will be held at a future date.