Edward Wynkoop was the first sheriff of Denver. After serving in the Civil War, Wynkoop worked to see that the Plains Indians were treated fairly. He was a popular public figure until he spoke out in protest after the Sand Creek Massacre. His investigations into the actions of Colonel John Chivington at Sand Creek turned the public against him but today he is a hero to Coloradans. The "Now You Know Bio" series is for grades 3-6.