"It was critical to me that we had someone in our coaching team with a deep knowledge of rugby in this country, at all levels, and could use those connections to the benefit of the All Blacks Sevens.
"Liam's background made him a logical addition to our coaching environment.
"Having Tomasi's sevens brain in the coaching line-up will be a huge asset. He is arguably the best playmaker the All Blacks Sevens have ever produced, and we'll be looking to transfer his knowledge of the game and attacking expertise onto the current crop of players.
"Tomasi also provides continuity to the side, having been the interim assistant coach for the past season. His on-going expert contribution to our game plan and attack strategy will be invaluable.
New Zealand Rugby high performance head Don Tricker paid tribute to last season's interim head coach Scott Waldrom.
"Scott did an outstanding job under difficult circumstances. He came in weeks before the season got underway and on the back of huge changes in the team with the departure of long-standing head coach Sir Gordon Tietjens.
"He brought in and developed some great new players last season, and was highly regarded by the team and the leadership at New Zealand Rugby.
"I know that Scott has a big future ahead of him coaching rugby and it will be great to see him develop further over the coming years."