The American Philosophical Society is saddened to report the passing of past APS President Clyde F. Barker on October 2, 2025 at his home in Haverford, PA at the age of 93. Dr. Barker was elected to the APS in 1997 and served as the Society’s 36th President from 2011 until 2017. His time leading the APS capped an impressive career that spanned nearly sixty years as a leading surgeon, inventor scientist, and hospital administrator at the University of Pennsylvania Hospital.
Clyde Barker was born in Salt Lake City in 1932. He was the youngest of four brothers, the son of Fred (a University of Utah psychology professor) and Jeanette (a high school teacher). He traveled East at the age of 15 to attend Phillips Exeter Academy, where he became a nationally ranked tennis player—#1 in the region, #3 in the nation for his age group. He went on to captain the tennis team at Cornell and twice play in the US Open, but decided on a career in medicine. After a successful enrollment at Cornell Medical School, he took an internship at the University of Pennsylvania Hospital in 1958, and served as a Surgical Resident until 1964. There, he developed a lifelong interest in transplantation.
After a brief vascular fellowship, Dr. Barker joined the Penn faculty. He also joined forces with scientist Rupert Billingham, to publish twelve field-defining papers on transplantation. Dr. Barker put his theories into practice when he performed the UPenn Hospital’s first human kidney transplant. The kidney functioned normally for forty-eight years, until the patient died of unrelated causes. Dr. Barker went on to perform increasingly complex procedures, maintaining outstanding results throughout his career. Under Dr. Barker’s leadership, the UPenn clinical transplant center became one of the best in the nation across a variety of procedures.
He rose rapidly through the ranks at UPenn, taking on teaching and administrative responsibilities while conducting groundbreaking research and performing extraordinary surgeries. He became head of transplantation in 1966, a Professor of surgery in 1973, Chief of Vascular Surgery in 1981, and Chairman of the Department of Surgical Research in 1983—all while mentoring graduate students who would go on to make further discoveries along the paths he opened up. As Chairman, Dr. Barker recruited a faculty that strengthened UPenn Hospital’s clinical and academic work, making it one of the most sought-after training hospitals in the United States. His contributions to the hospital were recognized through the establishment of the Clyde F. Barker Penn Transplant House in 2011.
Dr. Barker’s special combination of scientific insight, surgical skill, and administrative acumen made him one of the most influential American doctors of the past century. It also made him an outstanding and dedicated APS Member. Dr. Barker first assumed the APS Presidency following the unexpected death of former APS President, Baruch Blumberg. Rising to the occasion, Dr. Barker became a great supporter of and advocate for the future of the Society. Under his guidance, the APS weathered a period of notable staff turnover, ushering in new leadership to strengthen the APS Museum, Library, and Development programs. As former APS President and Dr. Barker’s successor, Linda Greenhouse (APS 2001), writes, “Charisma is an overused word but Clyde had it. His strength of character shone through in everything he said and did.”
Dr. Barker’s tenure as APS President overlapped with Keith Thomson’s time as APS Executive Officer and the two formed a close bond. During this time, the Society launched the Center for Native American and Indigenous Research (CNAIR), its first research center, with an NEH-supported endowment campaign. Bolstered by an award of nearly $1 million from the Mellon Foundation’s Native American Scholars Initiative, the Center has since supported projects related to cultural and language vitality, Indigenous self-determination, and Native American and Indigenous Studies. The APS hosts fellows and interns in support of community-oriented projects and goals. “Clyde’s contributions to the Society before, during, and after his tenure as President, were manifold and lasting,” reflects current Chief Executive Officer of the APS, Patrick Spero.
As an APS Member, Clyde Barker was a regular contributor to the Society’s Meeting, publications, and public programming. He spoke twice at APS Meetings, most notably for his 2007 talk, “Thomas Eakins and His Medical Clinics,” for which he was later was awarded the Henry Allen Moe Prize in the Humanities. His lecture on Benjamin Rush in 2018, remembered fondly by former APS Executive Officer, Bob Hauser (APS 2005), offered a thoughtful and critical perspective on one of Philadelphia’s earliest prominent surgeons and is noteworthy among Dr. Barker’s many contributions to the Society. “Clyde Barker stands out as an exemplary Member, leader, and contributor to the APS,” Bob adds.
Following his tenure as President, Dr. Barker’s dedication to the APS continued through his participation on numerous committees, including Publications, the Judson Daland Prize and Fellowship, and Jonathan E. Rhoads Medal, recently awarded in conjunction the UPenn Hospital and The College of Physicians of Philadelphia. He was also diligent in attending every Meeting of the Society, accompanied by his daughter, Elizabeth, and in attending many other APS events each year, demonstrating his ongoing commitment to the Society’s pursuit of useful knowledge. His final book, Surgeons and Something More: The history of surgery at the University of Pennsylvania, written in collaboration with his daughter, Elizabeth D. Barker, and published by the APS in 2024, serves as a culmination of these facets of Dr. Barker’s life. He leaves behind him a legacy of excellence as a leader, doctor, educator, researcher, and community member.
Clyde Barker’s numerous friends and colleagues will miss his charm, kindness, and delightful, quiet wit. “To those of us who have had the privilege of being active in the American Philosophical Society, it was Clyde’s utter commitment to the Society and his gentle wisdom in leadership that made him a model of leadership, a mentor, and a friend,” shares current APS President, Roger Bagnall (APS 2001). As past APS Executive Officer, Pat McPherson (APS 1983) reminisces, “Clyde Barker was a remarkable man professionally and personally and no one represented or cared about the APS more effectively than he.” The APS sends our deepest sympathies to Dr. Barker's friends and loved ones for their loss.
To learn more of Dr. Barker’s contributions to the APS and his career in medicine, please explore a collection of his lectures and publications presented during his time at the Society.
Henry La Barre Jayne Lecture,
“Thomas Eakins and His Medical Clinics” (2007)
“250 Years of America’s First Medical School: An Unexpurgated History” (2015)
“Tom Starzl and the Evolution of Transplantation” (2017)
Susan O. Montgomery Lecture
“The Many Faces of Benjamin Rush” (2018)
Surgeons and Something More: The History of Surgery at the University of Pennsylvania (2024)