The university offers degrees in more than 150 courses of study through 13 colleges and hosts 60 research centers and institutes. Texas Tech University has awarded over 200,000 degrees since 1927, including over 40,000 graduate and professional degrees. The Carnegie Foundation classifies Texas Tech as having "highest research activity". Research projects in the areas of epidemiology, pulsed power, grid computing, nanophotonics, atmospheric sciences, and wind energy are among the most prominent at the university. The Spanish Renaissance-themed campus, described by author James Michener as "the most beautiful west of the Mississippi until you get to Stanford", has been awarded the Grand Award for excellence in grounds-keeping, and has been noted for possessing a public art collection among the ten best in the United States.