From July 1807 to March 1810, while living in
Paris as a scholar of the
National Museum of Natural History, he was employed by
Louis Bonaparte to oversee his mineral collection. Though with historically uncertain medical credentials, he was reputedly a medical steward in Napoleon's army. and 1845. In 1846, he married Mary Ann Troost, the niece of his friend and fellow pioneer
William Gillis. That year, he bought five lots of land as one of the 14 co-founders of the Town of Kansas Company. From 1849 to 1850, at the peak of the
California gold rush, he and Gillis built the village's first hotel on the river levee, named Troost House and later renamed Gillis House. In 1854, he founded the
Kansas City Enterprise newspaper. In 1857, he incorporated the city's first Chamber of Commerce. He died on February 8, 1859, in William Gillis's mansion in Kansas City, Missouri. ==Legacy==