After two years practicing law in Wellington, he returned to Rotorua to join the law firm that is now McKechnie, Quirke & Lewis.
He worked mainly in the criminal jurisdiction and appeared in trials from the District Court through to the Court of Appeal.
Judge Bergseng left Rotorua in 1997, working in Auckland, Australia and latterly Tauranga. However he maintained close links with Rotorua and until recently conducted trials in the city.
Rotorua lawyer Murray McKechnie said Judge Bergseng had developed his skills "in this very courthouse".
"He is truly a son of Rotorua . . . he spent a good deal of his legal career here."
Mr McKechnie said two of the key qualities for a judge were character and judgement and Judge Bergseng possessed those "in abundance".
Paul Mabey QC said Judge Bergseng had experience "in law and life" and was not afraid of hard work.
Chief District Court Judge Jan-Marie Doogue spoke of the new judge's intellect and humility.
"You are an everyman judge," she said. "The role will be demanding but I have confidence in your ability."
Judge Bergseng thanked his wife, joking he will "forever be the junior judge".
He said he was ready for the challenge ahead.
"I would hope that anyone that had appeared before me will feel listened to, dealt with fairly and [understand] the reasons I have made the decision I have."