Rowena Green Matthews, born in 1938, is the G. Robert Greenberg Distinguished University professor emeritus at the University of Michigan, Ann Arbor. Her research focuses on the role of organic cofactors as partners of enzymes catalyzing difficult biochemical reactions, especially folic acid and cobalamin (vitamin B12). Among other honors, she was elected to the National Academy of Sciences in 2002 and the Institute of Medicine in 2004.