Karl Hoblitzelle was born on October 22, 1879 in St. Louis, Missouri. His father, Clarence Linden Hoblitzelle, was a veteran of the Confederate States Army during the American Civil War. His mother was Ida Adelaide Knapp. His maternal grandfather, Colonel George Knapp, was the founder of the Missouri Gazette, later known as the Missouri Republican and finally the St. Louis Globe-Democrat. He eventually had nine brothers and three sisters. Hoblitzelle was of Swiss, Austrian and English descent on his paternal side and of Irish, English and French descent on his maternal side. His ancestors were settlers who fought in the American Revolutionary War. His paternal great-grandfather, Samuel Ogle was the Governor of Maryland. Hoblitzelle graduated from high school in St. Louis, but his parents could not afford to send him to college.
Career
Hoblitzelle began his career working in real estate for his uncle; he worked in a soap factory, and later sold vegetables grown on his family farm as a market trader. He subsequently worked at the Louisiana Purchase Exposition of 1904. Hoblitzelle met Edward McMechin, a businessman who suggested he invest in vaudeville theaters, in 1904. By 1905, Hoblitzelle and his brother George K. co-founded the Interstate Theaters Company. The company operated vaudeville theaters in Texas, although it was headquartered in Missouri. It later became a chain of movie theaters. One of them was the Majestic Theatre in Dallas; another was the Majestic Theatre in San Antonio. More theaters were opened in Fort Worth, Waco and Houston as well as Shreveport, Louisiana, Birmingham, Alabama, Little Rock, Arkansas, and Wichita, Kansas. Hoblitzelle sold the company to RKO Pictures in 1930; however, he purchased it again in 1933. During World War II, Hoblitzelle worked with the United States Army to show patriotic films in his theaters. In 1951, Hoblitzelle sold the company to United Paramount. However, he "retained management rights in 165 theaters". Hoblitzelle was the first to add sound to movie theaters in the Southwest, and the first in the United States to add air conditioning. Hoblitzelle was also the chairman of Hoblitzelle Properties, a real estate conglomerate, and the Republic National Bank.
Hoblitzelle married Esther Thomas, later known as Esther Walker, a singer who predeceased him in 1943. They resided in Dallas, Texas. Hoblitzelle died on March 8, 1967 in Dallas. His funeral was held at the Park Cities Baptist Church, and he was buried in the Bellefontaine Cemetery in St. Louis. By the time of his death, he was worth an estimated $17 million. His estate went to the Hoblitzelle Foundation.