RAPID CITY, South Dakota, Dec. 18 -- The South Dakota School of Mines and Technology issued the following news release: Two South Dakota Mines professors have earned the honor of representing the United States on the global stage after being selected by the U.S. Department of States Bureau of Educational and Cultural Affairs (ECA) to share their expertise as part of the U.S. Speaker Program. Jon Kellar, Ph.D., professor of materials and metallurgical engineering, and Andrea Brickey, Ph.D., pro  more