O.K. Adcock was a pioneer Las Vegas merchant and a partner in the department store firm of Adcock and Ronnow. He came here from Caliente, where he had operated a similar, though smaller, store. He was active in civic and fraternal affairs, a charter member of the Las Vegas Rotary Club and the Las Vegas Elks Lodge. He was secretary of the Elks Club for many years. He was President of the Board of Education for several terms, and took a leading part in shaping the Las Vegas High School program during his incumbency.