The Los Angeles medical community is mourning the loss of Dr. Jack O’Brien, a board-certified family medicine physician, HIV specialist, clinical researcher, and co-founder of Haven Health, whose commitment to compassionate, affirming healthcare transformed the lives of countless patients throughout Southern California.
Dr. O’Brien passed away on June 27, 2026, at the age of 36, according to a public announcement shared by Haven Health. His death has prompted an outpouring of grief from colleagues, patients, healthcare professionals, and LGBTQIA+ advocates who remember him as a physician whose compassion matched his exceptional clinical expertise.
Throughout his career, Dr. O’Brien dedicated himself to breaking down barriers to healthcare for LGBTQIA+ individuals and people living with HIV, creating spaces where patients felt respected, understood, and safe.
Personal Details
Full Name: Dr. Jack O’Brien
Age: 36
Residence: Los Angeles, California
Date of Death: June 27, 2026
Place of Death: Unverified
Cause of Death: Not publicly disclosed
Profession: Board-Certified Family Medicine Physician, HIV Specialist, Clinical Researcher
Organization: Co-Founder, Haven Health
Funeral Arrangements: Not publicly announced
A Vision for Inclusive Healthcare
Dr. Jack O’Brien was widely recognized as one of Southern California’s leading advocates for accessible, inclusive healthcare.
As co-founder of Haven Health, he helped establish a practice dedicated to providing comprehensive, judgment-free medical care for LGBTQIA+ communities throughout West Hollywood and the greater Los Angeles region.
Together with his colleagues, he envisioned a healthcare environment where patients could openly discuss every aspect of their health without fear of stigma or discrimination.
That vision quickly became the defining mission of Haven Health and earned Dr. O’Brien the trust of hundreds of patients.
A Physician Who Listened
While Dr. O’Brien’s medical credentials earned widespread respect, many say it was his ability to genuinely connect with people that made him extraordinary.
Patients consistently described him as someone who listened carefully, treated everyone with dignity, and approached healthcare with empathy rather than judgment.
For many LGBTQIA+ individuals and people living with HIV—communities that have historically faced barriers within healthcare—Dr. O’Brien provided something many had struggled to find: a physician who made them feel completely safe.
His approachable personality, thoughtful communication, and unwavering commitment to patient-centered care became hallmarks of his practice.
Tributes From Patients
Following news of his passing, social media quickly filled with heartfelt tributes celebrating Dr. O’Brien’s impact.
Many former patients spoke about how he changed their lives by creating an environment built on trust and respect.
One patient shared:
“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.”
That sentiment has been echoed by countless others who credit Dr. O’Brien with helping them navigate some of the most difficult moments of their lives.
A Leader in HIV Medicine and Research
In addition to caring for patients, Dr. O’Brien made significant contributions to HIV medicine and clinical research.
His work focused on improving access to treatment, advancing patient education, and supporting evidence-based approaches that improved outcomes for individuals living with HIV.
Colleagues describe him as a physician who combined scientific excellence with genuine compassion, believing that outstanding healthcare required both technical expertise and human connection.
His influence extended beyond the examination room, helping shape conversations around equitable healthcare and affirming medical practices.
Remembered by Colleagues
Haven Health Co-Founder and CEO Mike Piscadlo confirmed Dr. O’Brien’s passing in a public statement, reflecting the profound loss felt throughout the organization.
Coworkers remember him as an inspiring leader whose passion for medicine motivated those around him to continually raise the standard of patient care.
Whether mentoring colleagues, collaborating on research, or advocating for underserved communities, Dr. O’Brien approached every responsibility with humility, professionalism, and purpose.
Funeral Arrangements
At the time of publication, funeral and memorial service arrangements have not been publicly announced.
Friends, colleagues, patients, and members of the broader healthcare community continue sharing messages of sympathy while honoring Dr. O’Brien’s extraordinary legacy of compassion and service.
A Legacy That Lives On
Although Dr. Jack O’Brien’s life was tragically cut short, the impact he made will continue to shape healthcare for years to come.
His unwavering commitment to dignity, inclusion, and compassionate medicine transformed the experiences of countless patients who found not only exceptional medical care but also acceptance, understanding, and hope through his work.
He will be remembered not simply as an outstanding physician, but as a trusted advocate, visionary leader, compassionate listener, and pioneer whose legacy continues through Haven Health, the patients he served, and the lives he forever changed.