Who is THIS man?!

[Gene C]

Clue #2

XXXXXX was probably the first American to appreciate early California history certainly he was the very first collector of Californiana. While In Monterey he began to gather Spanish documents which eventually numbered several hundred, consisting of some 4000 pages; originals and transcripts of originals - official reports of missions, explorations, Indian uprisings, governmental and political matters, taken from the heart of the records at Monterey, and

married Elizabeth Hamilton, the granddaughter of Alexander Hamilton on April 10, 1855. From this union was born an only child