Sessler Elected to Association of American Physicians (AAP)
Daniel I. Sessler, MD, vice president for Clinical and Outcomes Research at UTHealth Houston and tenured professor of anesthesiology, has been elected to the Association of American Physicians (AAP), one of the nation’s most prestigious honorary medical societies.
Election to the AAP recognizes physicians and physician-scientists who have made outstanding contributions to medical science, particularly through original and sustained investigative work that advances scientific knowledge and improves human health. Founded in 1885 by Sir William Osler and six other physician-scientists, the AAP is dedicated to “the advancement of scientific and practical medicine.” Membership is extended annually to a small and highly selective group of individuals whose research has had a profound and lasting impact on biomedical science and clinical care.
1. Holger K. Eltzschig, MD, PhD (L) and Daniel I. Sessler, MD (R)
New members are nominated by existing AAP fellows. Sessler was nominated by Serpil Erzurum, MD, executive vice president, chief research and academic officer, and chair of the Lerner Research Institute at Cleveland Clinic. His nomination was seconded by Holger K. Eltzschig, MD, PhD, professor and chair of the Department of Anesthesiology and vice president for Strategy and Development for Hospital-Based Programs at McGovern Medical School, UTHealth Houston, and by Jeffrey Balser, MD, PhD, president and chief executive officer of Vanderbilt University Medical Center and dean of Vanderbilt University School of Medicine.
Sessler is internationally recognized as the world’s most cited investigator in perioperative medicine and a pioneer of modern clinical outcomes research. His work has fundamentally reshaped perioperative care and improved outcomes for millions of surgical patients worldwide. A rare physician-scientist, Sessler’s research has not only advanced scientific understanding but has also permanently changed clinical practice.
Early in his career, Sessler challenged longstanding assumptions in perioperative care. At a time when surgical patients were routinely allowed to become hypothermic, his mechanistic studies and large randomized trials demonstrated that perioperative hypothermia significantly increases the risk of complications. This work established the field of perioperative thermoregulation and led directly to the now-standard practice of maintaining normothermia during surgery.
Sessler also introduced the concept of myocardial injury after noncardiac surgery (MINS), now recognized as a leading cause of postoperative mortality within 30 days of surgery. Through large multinational trials, he identified perioperative hypotension as a key modifiable risk factor and defined harm thresholds that have since been incorporated into international clinical guidelines and consensus statements. His research continues to guide perioperative blood pressure management and cardiovascular risk reduction worldwide.
“Dan is anesthesia’s preeminent clinical trialist,” said Eltzschig. “No other investigator has contributed foundational discoveries across so many perioperative domains while simultaneously setting global standards for trial design, statistical rigor, and execution.”
Over the course of his career, Sessler has led hundreds of large-scale randomized clinical trials, many enrolling thousands of patients across multiple countries. Several studies randomized more than 30,000 patients, placing them among the largest clinical trials ever conducted in perioperative medicine. His research spans perioperative pain, anesthetic depth, renal injury, postoperative delirium, airway management, and long-term surgical outcomes.
In addition to his clinical contributions, Sessler has made seminal advances in research methodology, developing innovative trial designs and statistical approaches—including cluster crossover designs and advanced methods for evaluating composite outcomes—that are now widely used in comparative effectiveness research.
Sessler is the founder and director of the Outcomes Research Consortium, the world’s largest anesthesia research collaborative. Under his leadership, the consortium has published nearly 2,500 peer-reviewed papers and trained more than 200 research fellows, many of whom now hold senior academic, clinical, and research leadership positions worldwide.
He has authored more than 1,000 scientific publications, including dozens in The New England Journal of Medicine, The Lancet, and JAMA. His work has been cited more than 110,000 times, placing him among the most influential physician-scientists across all fields of medicine.
Prior to joining UTHealth Houston, Sessler held senior leadership positions at Cleveland Clinic, the University of Louisville, the University of Vienna, and the University of California, San Francisco. His honors include a Fulbright Scholarship, the American Society of Anesthesiologists Excellence in Research Award, and the Bernard Eliasberg Award.
Election to the Association of American Physicians recognizes Sessler’s extraordinary career of sustained scientific discovery, global leadership, and enduring impact on patient care.