Inventor of the small, portable Deringer pistol. He saw his weapon become popular in Gold-Rush California.
He made long-barrel rifles for the U.S. military and the Indian tribes.
He did not see his invention as anything special and never patented his design, with the result being that Derringer knockoffs became prevalent throughout the country.
His father Henry Deringer Sr. made rifles for the Kentucky colonists.
His pistol was used to assassinate Abraham Lincoln. The newspaper story misspelled the name of the pistol with an extra r. From that point on they became known as Derringers.