He became a Fellow of the American Institute of Architects in 1876 and a founding associate of the predecessor firm of Alfred B. Mullett & Sons, with Alfred B. Mullett and William G. Steinmetz in 1882.
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In 1882, he set up a practice in New York with Hugo Kafka and William G. Steinmetz, later establishing Alfred B. Mullett & Sons to practice with his two elder sons.