Kerr-Barlow, 23, was similarly content with his decision, calling his involvement with the All Blacks a dream come true.
"I know I have to work hard to maintain my spot, firstly in the Chiefs and to push for further opportunities in the All Blacks.
"I have access to the best coaches in the world and am really enjoying all the environments that the variety of New Zealand rugby offers. I still have a lot to learn and feel this is the best place for me to do that."
One man who will provide some of the teaching was rapt the trio had committed their futures.
"The three players are outstanding men all in their own right and all bring something special to the group," said All Blacks coach Steve Hansen. "Liam is a natural leader and key member of the All Blacks, while Sam and Tawera have also impressed us since coming into the All Blacks in the past two years."