concocter

noun

1. One who or that concocts.

   “Ogden Nash, Adventures Of Isabel She took those pills from the pill concocter, And Isabel calmly cured the doctor.”

   “The idea that Milton's imitatio operates through a process of gathering and culling rather than one of sublimating and assimilating cuts against the grain of much recent criticism, which views Milton as the great concocter/transumer.”