Groznik was a Denobulan man who had a nasty habit of annoying the people near him. As a Denobulan, he had three wives, however it seems Kessil left him sometime in the early 2150s.
Sometime prior to 2149, he did something horrible to upset his wife Vesena. She hadn't forgiven him by 2152 despite the fact that he'd apologized twice, but Feezal felt she'd forgive him after another two years.
Between 2149 and 2152, his wife Kessil, who'd lived with him on Denobula for some time, decided to leave him to move in with her third husband, Bogga, on Teerza Prime. (ENT: "Stigma")
Groznik was Phlox's first wife's third husband, who together have a daughter named Indaura. While attending to his affairs back home, Dr. Phlox recorded a message to Dr. Lucas, requesting that Lucas contact Groznik and tell him that he was welcome to keep the Aldebaran drum set Phlox had loaned him. (ENT: "Zero Hour")