He earned his bachelor of science degree from Rutgers University and his master of science degree from New York University. He joined the faculty at The University of Texas at Austin in 1946, after serving as a weather officer during World War II and as an instructor of meteorology at New York University. Active in the American Meteorological Society for 33 years, Professor Jehn's research fields included micrometeorology and the meteorology and climatology of the Texas coastal zone. For one of his major research projects, he used data from ocean and wind currents to predict the movement of oil slicks. Additional biographical sources can be found in the Barker Texas History Center and the UT Office of Public Affairs.
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