Currently Chairman/CEO of Eller Media Company, the recognized leader in the out-of-home advertising industry. The Company operates in 32 major metropolitan markets across America and is a wholly owned subsidiary of Clear Channel Communications, Inc. Mr. Eller serves as a member of the Clear Channel Communications' Board of Directors, a publicly traded media company with outdoor, radio, and television properties.

Mr. Eller became Chairman of the Board and Chief Executive Officer of The Circle K Corporation on July 3, 1983 and resigned those positions and from the Board of Directors on May 7, 1990. In that time, he built Circle K into the second largest convenience store operation and the largest publicly owned convenience store chain in the United States. He built the Company from 1221 stores in 11 Western states to 4641 stores in 32 states (and an additional 1386 licensed or joint venture stores in 13 foreign countries). In the year before he became Chairman and CEO, Circle K's annual sales were $747,000,000; in 1989, Circle K's sales exceeded $3,400,000,000 with net earnings of $15,500,000.

After receiving his B.A. in business from the University of Arizona, he served in various capacities with Foster & Kleiser Outdoor Advertising Company from 1952 to 1960. From 1960 to 1962, he was an account supervisor for Needham Louis Brorby. Mr. Eller subsequently purchased the Arizona operations of F&K, renaming the company Eller Outdoor Advertising Company.

In 1968, he merged his company with an operator of a television and radio station to found Combined Communications Corporation (CCC) in which Mr. Eller served as President and Chief Executive Officer. He built CCC into one of the largest and most profitable media companies in the U.S. CCC owned and operated 7 major metropolitan television stations, 14 major metropolitan radio stations, 12 American and 2 Canadian outdoor advertising companies and 2 metropolitan daily newspapers. In 1979, he merged the company with Gannett, Inc.

In 1980, Mr. Eller became President and Chief Executive Officer of Columbia Pictures Communications and served in that capacity until he was instrumental in the merger of Columbia Pictures into the Coca-Cola Company, USA.

Mr. Eller serves on the Board of Directors of Clear Channel Communications, Inc., Traffic Audit Bureau, The Advertising Council, Inc., American Advertising Federation, El Dorado Investment Company, Phoenix Suns, Fiesta Bowl and SunVen Entertainment Group, Inc. He is formerly a member of the boards of Directors of Inter-Tel, Inc., Pinnacle West Capital Corporation, The Circle K Corporation, Eastern Airlines, Swensen's Ice Cream Company, The Public Broadcasting Corporation of America, Southwest Forest Industries, Columbia Pictures, Inc., and Turner Broadcasting Company.

In 1983, Mr. Eller established and funded The Karl Eller Center for the Study of the Free Enterprise Economy at the University of Arizona. In mid-1987, the University of Arizona named its business school for Mr. Eller.