ERNEST F. JOHNSON, a longtime chemical engineering professor and an expert in process control and hazardous waste management, died Feb. 2 in Freeport, Maine. He was 89. A member of the faculty from 1948 to 1986, Johnson received numerous awards for his research and teaching. He served as chairman of the chemical engineering department, associate dean of the faculty, and senior adviser to the University president. Johnson also was associated with the Princeton Plasma Physics Lab for 31 years, receiving a patent for designing a molten salt system for first-generation fusion power plants.
