Medical and health researchers

Olivier Gevaert

Olivier Gevaert is a biomedical data scientist and Associate Professor at Stanford School of Medicine, known for machine learning methods that fuse imaging, pathology, and omics data for cancer prognosis.

Olivier Hermine

Olivier Hermine (born 1962) is a French hematologist, professor at Université Paris Cité and head of clinical hematology at the Hôpital Necker in Paris, known for mastocytosis research.

Olivier Rascol

Olivier Rascol is a French neurologist and clinical pharmacologist, Professor of Clinical Pharmacology at Toulouse University Hospital since 1993, known for Parkinson's disease trials including the 2000 ropinirole study and the 2024 LIXIPARK trial.

Olivier Sitbon

Olivier Sitbon (born 1961) is a French professor of respiratory medicine at Hôpital Bicêtre known for clinical trials in pulmonary arterial hypertension, including the 2015 GRIPHON trial.

Olle Kämpe

Olle Kämpe is a Swedish professor of clinical endocrinology at Karolinska Institutet whose research on Addison's disease and APS-1 produced autoantibody tests in clinical use.

Olle Ringdén

Olle Ringdén is a Swedish professor of transplantation immunology at Karolinska Institutet who created and led its Centre for Allogeneic Stem Cell Transplantation and reported 27 first-in-world procedures.

Olli T. Raitakari

Olli T. Raitakari (born 1963) is a Finnish professor of cardiovascular medicine at the University of Turku who leads the Cardiovascular Risk in Young Finns Study, begun in 1980.

Olof Nyrén

Olof Nyrén is a Swedish physician and cancer epidemiologist, Professor Emeritus at Karolinska Institutet, known for NEJM studies linking gastroesophageal reflux to esophageal adenocarcinoma and a 1986 trial on non-ulcer dyspepsia.

Oluf Pedersen (physician-scientist)

Oluf Pedersen, born 1945, is a Danish physician-scientist and professor at the University of Copenhagen known for the Steno-2 trial, which changed type 2 diabetes treatment worldwide, and for gut microbiome research.

Sep 17, 2026

Omar Abdel-Wahab

Omar Abdel-Wahab is a physician-scientist who chairs the Molecular Pharmacology Program at Memorial Sloan Kettering Cancer Center and treats leukemia, known for work on RNA splicing mutations and IDH genes in blood cancers.

Ömer Yılmaz

Ömer Yılmaz, also known as Omer H. Yilmaz, is a Turkish-American physician-scientist and gastrointestinal pathologist at MIT who studies how fasting and diet shape intestinal stem cells and cancer.

Omid Hamid

Omid Hamid is an American medical oncologist and melanoma immunotherapy researcher at The Angeles Clinic and Cedars-Sinai in Los Angeles, an investigator in early trials of ipilimumab and pembrolizumab.

Onur Boyman

Onur Boyman is a Swiss physician-scientist and professor of clinical immunology at the University of Zurich, known for cytokine immunotherapy and Long Covid complement research.

Onyekachi Ifudu

Onyekachi Ifudu, also published as O. Ifudu, is a nephrologist and board-certified internist in Brooklyn, New York, known for 1990s research linking dialysis intensity to anemia control.

Ooi Eng Eong

Ooi Eng Eong, also published as Eng Eong Ooi, is a Singapore-based vaccinologist and physician-scientist at Duke-NUS Medical School known for dengue immunology and for leading Singapore's COVID-19 vaccine collaboration with Arcturus Therapeutics.

Orah S. Platt

Orah S. Platt is a professor of pediatrics at Harvard Medical School based at Boston Children's Hospital, known for her landmark studies of pain and mortality in sickle cell disease.

Ormond A. MacDougald

Ormond A. MacDougald is a physiologist studying adipose tissue biology at the University of Michigan, where he holds the John A. Faulkner Collegiate Chair of Physiology.

Orrin Devinsky

Orrin Devinsky is an American neurologist and epileptologist who directs the NYU Comprehensive Epilepsy Center and led the trials behind the first FDA-approved cannabidiol epilepsy therapy.

Orson W. Moe

Orson W. Moe is a nephrologist and Professor of Internal Medicine and Physiology at UT Southwestern Medical Center in Dallas, known for kidney-stone research and Klotho studies in chronic kidney disease.

Orvar Swenson

Orvar Swenson (1909–2012) was a Swedish-born American pediatric surgeon who identified the cause of Hirschsprung's disease and devised its first effective operation, the Swenson pull-through procedure.

Osagie Obasogie

Osagie Obasogie is an American legal scholar and bioethicist, Haas Distinguished Chair and professor of law and bioethics at UC Berkeley, elected to the National Academy of Medicine in 2021.

Oscar D. Ratnoff

Oscar D. Ratnoff (1916–2008) was an American hematologist and blood-clotting researcher who discovered the Hageman factor, now factor XII, and named the waterfall hypothesis of coagulation.

Sep 17, 2026

Oscar E. Suman

Oscar E. Suman is an American burn-injury researcher and professor at the University of Texas Medical Branch who received a 2015 Presidential Early Career Award.

Oscar Salvatierra

Oscar Salvatierra Jr. (1935–2019) was an American transplant surgeon, chief of the UCSF transplant program and later a Stanford professor, who pioneered pediatric kidney transplantation and helped draft the National Organ Transplant Act of 1984.

Oskar Kohnstamm

Oskar Kohnstamm (1871–1917) was a German neurologist and psychiatrist who demonstrated the involuntary arm movement called the Kohnstamm phenomenon and ran a sanatorium at Königstein.

Oskar Minkowski

Oskar Minkowski (1858–1931) was a German physician and internist who showed in 1889 that removing a dog's pancreas produces severe diabetes, the experimental starting point for the discovery of insulin.

Oskar Vogt

Oskar Vogt (1870–1959) was a German neurologist who, with his wife Cécile, built the Kaiser Wilhelm Institute for Brain Research in Berlin, mapped the cerebral cortex, and examined Lenin's brain.

Oswald Hope Robertson

Oswald Hope Robertson (1886–1966) was an American physician and experimental-medicine researcher who created the first blood bank on the Western Front in 1917–1918, storing citrated blood on ice.

Oswald Schmiedeberg

Oswald Schmiedeberg (Johann Ernst Oswald Schmiedeberg, 1838–1921) was a Baltic German pharmacologist who established experimental pharmacology, co-founded its first journal in 1873, and trained about 120 pupils from 20 countries.