Chadzik is an Orion civilian scientist.
Dr. Chadzik served on the SS Tsiolkovsky in 2364 as a civilian non-Starfleet scientist. He was aboard and helping study a red giant star when the polywater incident occurred that resulted in the ship's destruction.
Chadzik was able to synthesize the polywater into a new club drug called "Polyanna", and escaped the ship with Captain Misha Volkov to join the new crime syndicate she would form after the Tsiolkovsky's destruction. As such, he became the first recruit for her new criminal Volkov Cartel.
When Volkov acquired the IKS Targ and made the bird-of-prey her flagship, he joined her on the Targ's crew and continued his drug-related science work there.