The Air Pollution Control Officer in question was Louis McCabe, a geologist with a background in chemical engineering. McCabe initially suspected that smog was a result of sulfur dioxide pollution, and proposed that the county convert the suspected pollutant into fertilizer through a costly process. Beckman was not convinced that sulfur dioxide was the real culprit behind Los Angeles smog. He visited Gary, Indiana, where steps were being taken to address sulfur dioxide pollution, and was struck by the characteristic smell of sulfur in the air. Returning, Beckman convinced McCabe that they needed to search for a different cause.