Mint-engraver. Son of Johann Christian Koch (1680-1742), who he eventually succeeded as Master of the Mint in Gotha. Director of the Mint from 1766.1
Boswell visited Koch at the Mint in Gotha on October 20, 1764. Koch supplied him with new coins and good Rhenish Wine, and was described by Boswell as "one of your old staunch Germans".