Born on August 26, 1806, in
Montgomery County,
Tennessee, Humphreys was the son of attorney and judge
Parry Wayne Humphreys and his wife Mary West. His father later served on the State Supreme Court, was elected to one term in Congress, and served nearly two decades on the state judicial circuit. Humphreys was educated privately and attended the law department of
Transylvania University. Failing to graduate due to ill health, he
read law with an established firm in 1828. He passed the bar and entered private practice in
Clarksville, Tennessee from 1828 to 1829. He moved to
Somerville, Tennessee, continuing in private practice from 1829 to 1839. He was elected and served as a member of the
Tennessee House of Representatives from 1835 to 1838. He was the 3rd Attorney General of Tennessee from 1839 to 1851. He was reporter for the
Tennessee Supreme Court from 1839 to 1851. He resumed private practice in
Nashville, Tennessee from 1851 to 1853. ==Federal judicial service==