Other than Gregg Popovich, who went to the Finals six times, winning five, only one coach being mentioned as a possible Nets head man has a ring. Tyronn “Ty” Lue, currently an assistant to the Clippers Doc Rivers, won in 2016 and took three straight Cavaliers teams to the Finals.
Jeff Van Gundy went to the Finals as Knicks head coach in 1999 but didn’t win. The others, like Jason Kidd and Jacque Vaughn, never got to the mountain top at least as a coach.