Medical and health researchers

Claudio Fiocchi

Claudio Fiocchi is a Brazilian-trained physician and researcher at the Cleveland Clinic known for showing that angiogenesis contributes to inflammatory bowel disease and for his 2011 New England Journal review of ulcerative colitis.

Claudio Ponticelli

Claudio Ponticelli (1936–2026) was an Italian nephrologist in Milan whose randomized trials of methylprednisolone and chlorambucil in membranous nephropathy, published from 1984, produced the Ponticelli regimen.

Claudio Ronco

Claudio Ronco is an Italian nephrologist, Director of Fondazione IRRIV in Vicenza, known for continuous renal replacement therapy, cardiorenal syndromes, and CARPEDIEM, the first dialysis machine built for newborns.

Claudiu T. Supuran

Claudiu T. Supuran, born 1962, is a Romanian-born Italian medicinal chemist and full professor at the University of Florence known for carbonic anhydrase inhibitors and SLC-0111.

Claudius Regaud

Claudius Regaud (1870–1940) was a French physician and biologist who founded French radiotherapy, co-founded the Fondation Curie with Marie Curie, and established the dose fractionation principle underlying modern radiation oncology.

Claus Christiansen (Danish physician)

Claus Christiansen, born in Aalborg, Denmark in 1942, is a Danish physician and osteoporosis researcher whose 1987 trial showed calcium does not prevent postmenopausal bone loss as effectively as estrogen.

Claus Nerlov

Claus Nerlov is a stem cell biologist and Professor of Stem Cell Biology at the University of Oxford who studies how blood cells form and how leukemia arises.

Claus Niederau

Claus Niederau is a German gastroenterologist and hepatologist, chief physician in Oberhausen, known for hemochromatosis and hepatitis B research, including a 1996 New England Journal of Medicine study.

Claus Vogelmeier

Claus Vogelmeier (born 1956) is a German pulmonologist at Marburg who led the POET-COPD trial, helped lead FLAME, and has chaired the GOLD COPD strategy since 2014.

Clay F. Semenkovich

Clay F. Semenkovich is an American endocrinologist who is Chief of Endocrinology, Metabolism, and Lipid Research at Washington University School of Medicine in St. Louis, studying lipid metabolism.

Clemens A. Schmitt

Clemens A. Schmitt, born 1967 in Frankfurt, is a German hematologist, oncologist, and cancer researcher who has led the University Clinic for Hematology and Internal Oncology at Kepler University Hospital in Linz since 2019.

Clemens von Pirquet

Clemens von Pirquet (1874–1929) was an Austrian pediatrician who coined the term "allergy" in 1906, devised the first tuberculin skin test, and held the chair of pediatrics at the University of Vienna.

Clement A. Finch

Clement A. Finch, known as Clem Finch, was an American hematologist at the University of Washington whose research defined how the body acquires, uses, and stores iron.

Sep 17, 2026

Clement J. McDonald

Clement J. McDonald was an American physician and medical informatics researcher, known for creating Regenstrief Medical Record, LOINC terminology, and the Indiana Network for Patient Care.

Clifford A. Hudis

Clifford A. Hudis is an American medical oncologist who led breast cancer care at Memorial Sloan Kettering and has been chief executive of ASCO since 2016.

Clifford J. Rosen

Clifford J. Rosen, also published as Clifford Rosen, is an American endocrinologist at MaineHealth Institute for Research in Portland, Maine, and a Tufts professor known for osteoporosis trials.

Clifford P. Stanners

Clifford Paul Stanners is a Canadian biochemist and McGill University professor whose research on carcinoembryonic antigen (CEA) showed it functions as an intercellular adhesion molecule.

Clifford R. Jack

Clifford R. Jack is a neuroradiologist and Alzheimer's researcher at Mayo Clinic in Rochester, Minnesota, known for the 2009 dynamic biomarkers model and the 2016 A/T/N classification.

Clifton Bogardus

Clifton Bogardus is an American diabetes and obesity researcher, Scientist Emeritus at NIH's Phoenix Epidemiology branch, known for Pima Indian studies showing insulin resistance predicts type 2 diabetes.

Clifton E. Barry

Clifton E. Barry III, full name Clifton Earl Barry, is an American tuberculosis researcher who chiefs NIAID's Tuberculosis Research Section and helped develop the drug pretomanid.

Sep 17, 2026

Clifton Watson Callaway

Clifton Watson Callaway is an American emergency physician and resuscitation scientist at the University of Pittsburgh, known for research on brain injury after cardiac arrest.

Cliona M. Rooney

Cliona M. Rooney is an immunologist and virologist at Baylor College of Medicine in Houston known for developing EBV-specific T-cell therapy, now standard of care in Europe, for EBV-associated lymphomas.

Clive Ballard

Clive Ballard is a British old age psychiatrist and dementia researcher, Professor of Age Related Diseases at the University of Exeter since 2016 after holding a chair at King's College London.

Clive Kearon

Clive Kearon was an Irish-born Canadian thrombosis specialist and professor of medicine at McMaster University whose New England Journal trials changed anticoagulation practice; he died in 2020.

Clive Noble

Clive Noble (1938–2022) was a South African orthopedic surgeon, the country's first doctor to specialize in sports injuries, who co-founded SASMA, edited its journal, and improved boxing glove safety.

Clive Wood

Clive R. Wood is a British-trained immunologist credited with discovering the PD-1: PD-L1/PD-L2 cancer immunotherapy pathway, who led discovery research at Boehringer Ingelheim before joining OrbiMed in 2025.

Clyde W. Yancy

Clyde W. Yancy, also known as Clyde Yancy, is an American cardiologist who is Chief of Cardiology at Northwestern and chaired the 2013 ACCF/AHA heart failure guideline.

Coen D.A. Stehouwer

Coen D.A. Stehouwer (born 1960) is a Dutch internist and professor of internal medicine at Maastricht University, known for research on the vascular complications of type 2 diabetes.

Colin B. Begg

Colin B. Begg is a biostatistician who chairs the Department of Epidemiology and Biostatistics at Memorial Sloan Kettering Cancer Center and has edited the journal Clinical Trials since 2014.