ウィリアム・スミス・クラーク
William S. Clark, president of the Massachusetts Agricultural College, had also been one of Goessmann's students at Göttingen, and in 1869 Goessmann was appointed professor of chemistry at MAC. His research focussed on the chemistry of crops and agricultural soils. In addition to his professorship, he was chemist to the Massachusetts Board of Agriculture in 1873, director of the Massachusetts Agricultural Experiment Station in 1882, and analyst of the Massachusetts Board of Health in 1883.