Ms Cummins said it was a great feeling to see her father recognised for the work he did in those two decades.
"We didn't initially realise how many people dad had touched but it has become so clear from the support we've had since his passing."
Among Mr Rolleston's many roles, he was closely involved in the set-up and administration of Ngati Whakaue Taumata, and was its former chairman.
Within his role, he helped set up the Ngati Whakaue early learning centre, Te Ao Kapurangi, in Pererika St, and the early education centre, Te Puna Akoranga o Ngati Whakaue, in Ranolf St.
The 77-year-old died from liver cancer last July and Ms Cummins said the book launch was all about recognising and remembering him.
"This book will be the legacy dad leaves behind because it celebrates the 25 years he devoted to Ngati Whakaue.
"There were people coming from all over New Zealand to give their support and show respect for the work dad did."
Mrs Cummins said she had received positive feedback about the launch. "We wanted the day to be a celebration, not a day of sadness. Dad was always lighthearted."
Contributing to the book was Norma Sturley who wrote about Mr Rolleston's work on the paepae during various tangi and meetings.
"I think the book is a wonderful tribute testament to Mitai, when it comes down to it, the basic korero was about Ngati Whakaue. He was very passionate about his iwi to the point that he helped put it on the map," she said.
"[Mr Rolleston] was a people's person, with his friendly manner he could fit into all circles, from the queen of England just as easy to the ordinary person in the street, he was no different.
"The launch was fantastic and the number of people who turned up was a real tribute to who he was."
Mitai Rolleston, He Kanohi o Kitea o Ngati Whakaue can be purchased at McLeods Bookshop or by emailing Mrs Cummins, tonicummins@yahoo.com.