His siblings included William Gardner, founder the Choate School in Wallingford, Connecticut, Joseph Hodges Choate and Caroline von Gersdorff.
[2] Choate eventually moved to Westchester County, New York, where he established his own sanitarium.
One of Choate's most famous patients was politician and New-York Tribune founder Horace Greeley.
Following his defeat for the presidency of the United States in 1872, Greeley checked into Choate’s sanitarium, where he died a few weeks later.
Choate died in 1896, but his sanitarium remained open for another decade.