German surveyor and cartographer and volunteer for the New Orleans Greys during the Texas Revolution.
He fought in the siege of Bexar and battle of Coleto. Ehrenberg survived the Goliad massacre and prairies and posed as a Prussian salesman to the Mexicans.
Ehrenberg then returned to Germany and studied mining at Freiburg University. In the early 1840s he was an English teacher at Halle University.
He traveled to the Gadsden Purchase in 1854 and made the first map of the purchase. In 1855 he surveyed and helped incorporate the town of Colorado City, Arizona.