Jacqueline K. Barton, is an American chemist. She worked as a professor of chemistry at Hunter College (1980–82), and at Columbia University (1983–89) before joining the California Institute of Technology. In 1997 she became the Arthur and Marian Hanisch Memorial Professor of Chemistry and from 2009 to 2019, the Norman Davidson Leadership Chair of the Division of Chemistry and Chemical Engineering at Caltech. She currently is the John G. Kirkwood and Arthur A. Noyes Professor of Chemistry, Emerita.

The Priestley Medal is the highest honor conferred by the American Chemical Society (ACS) and is awarded for distinguished service in the field of chemistry. Established in 1922, the award is named after Joseph Priestley, one of the discoverers of oxygen, who immigrated to the United States of America in 1794. The ACS formed in 1876, spearheaded by a group of chemists who had met two years previously in Priestley's home.