Simon Stagg (Earth-4678)

Simon Stagg founded Stagg Enterprises and eventually decided to sell his pharmaceuticals as bioweapons and perform unethical experiments with Scarecrow's fear toxin. He then made a deal with Scarecrow, hoping to use his fear gas for profit. He created a weapon known as the Cloudburst, which launched and amplified the effects of the fear toxin.

Source

 * https://dc.fandom.com/wiki/Simon_Stagg_(Arkhamverse)