1736 - 1800 ~ Roots of the De Smet family.
1801 - 1821 ~ Pieter Jan answers the call.
1821 - 1823 ~ The Jesuit novitiate at White Marsh.
1823 - 1833 ~ Florissant and St. Louis.
1834 - 1836 ~ Home again.
1837 - 1839 ~ The Potawatomi mission.
1840 - 1840 ~ The Flathead rendezvous.
1841 - 1842 ~ A reduction in the Rockies ?
1843 - 1844 ~ The voyage of the Infatigable.
1845 - 1846 ~ Quest for the Blackfeet.
1847 - 1850 ~ Bookkeeper in St. Louis .
1851 - 1854 ~ The Fort Laramie treaty of 51.
1855 - 1859 ~ Chaplain in the U.S. Army.
1860 - 1865 ~ The Civil War.
1866 - 1868 ~ The Great Powder River Council.
1869 - 1873 ~ Parting of the way.