Leo (Lee) Guy Blackstock, attorney, teacher, and World War II hero, was born on November 1, 1899, at Whitt, Texas, the son of Rabun A. and Pearl (Mathis) Blackstock. He attended high school in Weatherford and then enrolled in the University of Texas, where he earned a B.A. degree in economics in 1923, an M.A. degree in business administration in 1925, and, while holding a full-time teaching position in the College of Business Administration, a J.D. degree (with highest honors) from the UT law school in 1933. He taught at Trinity University in 1924–25, when the institution was located at Waxahachie, and at Sam Houston State Teachers College (now Sam Houston State University) from 1925 to 1927. With some interruptions he served on the faculty of the University of Texas from 1927 to 1971 in both the College of Business Administration and the School of Law.
Blackstock took a leave of absence from the university from 1937 to 1939 to serve as chief examiner of the gas utilities division of the Railroad Commission of Texas. In 1936 he was commissioned a captain in the United States Army Reserve and was on active duty in the army from November 1, 1940, to November 30, 1946. He was a graduate of the Command and General Staff School and assistant judge advocate of the Tenth Army Corps; he served in the Pacific Theater, where he participated in the New Guinea campaign of 1944, the initial invasion of the Philippines at Leyte in 1944, and the Mindanao campaign in 1945. He was assigned from October 1945 to November 1946 to the occupation forces in Japan, where he was chief of the prosecution division, legal section, of the Supreme Command of the Allied Powers in Tokyo and was in charge of the prosecution of Japanese war criminals (classes B and C). He received numerous decorations and citations, including the Bronze Star. After he was released from active duty as a colonel, he remained in Japan as a civilian attached to the army, from December 1, 1946, to August 8, 1948, and continued his work in the prosecution of war criminals. His work, however, did not prevent him from enjoying a close and warm relationship with many Japanese friends for the remainder of his life.
Afterward, Blackstock returned to the University of Texas, where he was professor of business law in the College of Business Administration and, from 1953 to 1966, visiting professor of military law in the School of Law. He retired from the university on May 31, 1971, when he became professor emeritus. His book, Cases on Military Justice (1954), was a significant contribution in that field. He also wrote several other works and lectured extensively off campus on various aspects of law.
He was married to Harriet L. Barrickman on June 30, 1923, at New Braunfels; they had two sons. On May 26, 1948, he was married to Hannah-Graham Belcher in two ceremonies (official and religious) at Yokohama and Tokyo, Japan. He died on September 4, 1972, and was buried in Fort Sam Houston Cemetery in San Antonio. Several years before his death he gave his fine collection of books on military law to the library of the University of Texas School of Law. In 1973 the Leo G. Blackstock Fund was established to provide an annual scholarship to a prelaw undergraduate in the College of Business at the University of Texas at Austin.