Genpo was appointed as a translator of the astronomical observatory of the TOKUGAWA shogunate and translated an official letter from President of the United States which was brought by Matthew (Calbraith) PERRY, and also visited Nagasaki City as a member of negotiators with Russia.
徳川幕府天文台翻訳員となり、マシュー・ペリー来航時に米大統領国書を翻訳、また対露交渉団の一員として長崎市にも出向く。