Dr. Hartwig's research fields included physical electronics and instrumentation, cryogenics, and superconductivity. He invented a digital temperature transducer and was the first to observe the photodielectric effect in semiconductors at low temperature. Professor Hartwig also directed the Electronic Materials Research Laboratory at the University. In 1979 the College of Engineering recognized him with a teaching award. Additional biographical sources can be found in the Barker Texas History Center and the UT Office of Public Affairs.
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