query: Who started metallurgy?
passage: Metallurgy
The extraction of iron from its ore into a workable metal is much more difficult than for copper or tin. The process appears to have been invented by the Hittites in about 1200BC, beginning the Iron Age. The secret of extracting and working iron was a key factor in the success of the Philistines.[5][12]
passage: John Ferreol Monnot
John Ferreol Monnot (May 13, 1864 – ?) was an American metallurgical and mining engineer. He is best known for inventing the first successful process for manufacturing copper-clad steel.