Ervin Stone Yen (born 1954) is an American physician and politician who represented the 40th District in the Oklahoma Senate from 2014 to 2018. Yen was born in Taipei, Taiwan, in 1954. His parents moved to the United States in 1959 and settled in northwest Oklahoma City. Yen graduated from Putnam City High School in Warr Acres. Yen earned a Bachelor of Science degree in zoology from the University of Oklahoma and then a medical degree from the University of Oklahoma College of Medicine. Outside of politics, Yen works as an anesthesiologist. He witnessed Oklahoma's October 28, 2021 execution of John Grant with a three-drug lethal injection protocol and testified as an expert for the state Attorney General's office that the prisoner was fully unconscious despite some witnesses claiming they observed him struggling to breathe, convulsing, and vomiting on the execution gurney. More information...
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