[6] In 1883, Henshaw won election as Justice of the Peace, or Police Court judge, in Oakland, California at the age of 25.

[5] In 1889, he was found in contempt of the Superior Court for not vacating the office of Police Judge to the next elected official, S. F.

[9][10] In December 1894, Henshaw successfully ran on the Republican ticket for election to the California Supreme Court for a 12-year term.

[17] In 1911, California attorney William Denman proposed impeachment proceedings against Henshaw in relation to the procedures for signing an order of rehearing of the appeal of Abe Ruef.

[18][19] In November 1918, Henshaw denied charges that he had accepted a bribe while still a justice to influence his vote in the estates and trust case of Nevada Senator James G.

[20][21][22][23] After stepping down from the bench, Henshaw pledged to work in Washington, D.C., as one of President Woodrow Wilson's business experts fixing government, or so-called "dollar-a-year" man, but there is no record he did so.