Lucille Freeman Glasscock, philanthropist, rancher, and author, was born in Winnsboro, Louisiana, on October 11, 1898, the daughter of John Guy and Lillie Grace (Carr) Freeman. After her secondary education, she studied for a year at Southwestern Baptist Theological Seminary in Fort Worth. In 1917 she married Charles Gus Glasscock, a cattle buyer and later successful independent oil producer, in Fort Worth. They lived in New Orleans before returning to Texas, where his work in oil and ranching led them to numerous towns throughout Texas, including San Antonio, Big Spring, Ranger, and Corpus Christi. The couple had one son and one daughter.
After her marriage Lucille Glasscock wrote several magazine articles on the petroleum industry. In 1952 her book A Texas Wildcatter, which traced the career of her husband, was published by the Naylor Company. She also was co-owner with her husband of the 12,000-acre 4-G cattle ranch in Duval County. In 1965, when her husband died, she became manager of the ranch and also ran the family oil business for several years. In 1968 the United States Soil Conservation Service honored her as an outstanding conservationist for her ranch work.
With the financial success of her family holdings she donated buildings to institutions including Southwestern Baptist Theological Seminary, Corpus Christi State University, Baylor University, and the South Texas Children's Home in Beeville. She also supported the Corpus Christi Art Foundation and the Corpus Christi Symphony. Mrs. Glasscock was on the board of directors of Corpus Christ State University, which presented her with an honorary doctorate in 1972. Other organizations to which she belonged included the Corpus Christi Byliners, the International Mark Twain Society, and the Corpus Christi Yacht Club. She was a Baptist. She maintained an apartment in Corpus Christi, where her family's oil interests were based. In addition to their Duval County ranch, the family owned a ranch in Montana and a home in Wyoming. Lucille Glasscock died in Corpus Christi on May 14, 1991, and was buried there at Seaside Memorial Park. She was survived by her two children and numerous grandchildren.