[1] From July 1807 to March 1810, while living in Paris as a scholar of the National Museum of Natural History, he was employed by Napoleon III to oversee his mineral collection.

[3] In 1816, Troost took a geological trip to New Jersey organized by William Maclure, and remained in America.

[3] Troost moved to the frontier village variously called West Port Landing or Kansas, and became its first resident physician.

[3] In 1846, he married Mary Ann Troost, the niece of his friend and fellow pioneer William Gillis.

[6] He was listed as a trustee when Kansas, Missouri was finally legally incorporated as a town by Jackson County in 1850.