The Southern California medical community is mourning the unexpected loss of Dr. Jack O’Brien, a respected family medicine physician, HIV specialist, and co-founder of Haven Health whose compassionate approach to medicine transformed the lives of countless patients. He passed away on Saturday, June 27, 2026, at the age of 36.
News of his passing has prompted an overwhelming outpouring of grief from patients, colleagues, and LGBTQ+ advocates who remember him not only as an outstanding physician but also as someone who made every individual feel respected, understood, and genuinely cared for.
Personal Details
Full Name: Dr. Jack O’Brien
Age: 36
Residence: Southern California
Profession: Board-Certified Family Medicine Physician, HIV Specialist, Clinical Researcher
Organization: Haven Health
Date of Death: Saturday, June 27, 2026
Cause of Death: Not publicly available at the moment
Family Information: Not publicly available at the moment
Funeral Arrangements: Not publicly available at the moment
A Physician Who Changed Lives
Throughout his career, Dr. Jack O’Brien became widely recognized for combining medical expertise with genuine compassion. As a board-certified family medicine physician and HIV specialist, he dedicated his work to improving healthcare access for LGBTQIA+ individuals and people living with HIV, creating an environment where patients felt accepted rather than judged.
His work extended beyond routine medical care. Dr. O’Brien was deeply involved in clinical research and preventive medicine, helping advance treatment options while advocating for healthcare that emphasized dignity, inclusion, and trust.
Those who knew him often said his greatest gift was his ability to listen. Patients consistently described appointments that felt more like conversations than clinical visits, allowing them to openly discuss concerns they had previously been reluctant to share.
Building Haven Health
Dr. O’Brien played a central role in establishing Haven Health, a practice created to provide affirming, judgment-free healthcare for LGBTQIA+ communities throughout West Hollywood and the greater Los Angeles region.
Following his passing, Haven Health Co-Founder and CEO Mike Piscadlo announced the heartbreaking news, describing Dr. O’Brien as an exceptional physician whose vision helped shape the organization and improve the lives of countless patients.
His commitment to creating a welcoming healthcare environment became one of the defining characteristics of Haven Health and remains an enduring part of his professional legacy.
Patients Remember a Trusted Friend
Perhaps the strongest testament to Dr. O’Brien’s impact can be found in the heartfelt tributes shared by those he cared for.
Many described him as more than their physician. He became a trusted adviser, an advocate, and someone who made difficult conversations feel comfortable through empathy and understanding.
One patient reflected:
“Jack knew how to talk to his patients and how to listen. He never judged anything someone did. He was the first doctor I could actually open up to and be honest about my health needs. He was such an amazing doctor, friend, and human being. This one hurts.”
Messages similar to this have continued to appear across social media, with former patients sharing stories of how Dr. O’Brien helped them navigate difficult diagnoses, improve their health, and regain confidence during challenging periods of their lives.
An Enduring Legacy of Compassion
Although Dr. O’Brien’s life was tragically brief, the influence he had on his profession and his community will endure for many years.
Colleagues remember him as an innovative physician who combined clinical excellence with humility and kindness. Patients remember someone who treated every person with respect regardless of their background or circumstances.
His dedication to equitable healthcare, HIV treatment, LGBTQIA+ advocacy, and patient-centered medicine leaves behind a legacy that extends far beyond the walls of his clinic.
Funeral Arrangements
At the time of publication, funeral and memorial service arrangements have not been publicly available at the moment. Additional information is expected to be shared by his family or Haven Health when appropriate.
As family, friends, colleagues, and patients continue to mourn his passing, Dr. Jack O’Brien is being remembered as a physician whose greatest accomplishment was not simply practicing medicine, but making people feel valued, accepted, and cared for. His compassion, professionalism, and unwavering commitment to serving others will continue to inspire everyone fortunate enough to have known him.