As a shearer, he has been a Golden Shears open semi-finalist and was part of a crew that set a world three-stand lambs record for nine hours in 1997.
A son and daughter have also been competitive shearers.
In 2015, Hadfield and his wife, Nukuhia Hadfield, won the Ahuwhenua Trophy for Māori excellence in sheep and beef farming for their running of Mangaroa Station, off the inland route between Wairoa and Gisborne.
They were also organisers of the Wairoa A&P Show shearing championships for several years.
Hadfield was a delegate to Shearing Sports New Zealand’s national committee for several terms, before standing down last year.
Hadfield was surprised by the appointment, given what he understood of the high quality of contenders for the position of manager.
He said he and his wife had been planning to be “just spectators” at the World Championships.
Four of the six team members have already been named.
They are the 2019 world champion South Canterbury blade-shearing pair Allan Oldfield and Tony Dobbs, and Golden Shears machine-shearing and woolhandling champions Toa Henderson, of Kaiwaka (Northland) and Joel Henare, of Motueka, respectively.
The remaining machine shearer and woolhandler will be named after the selection series finals at the Rangitīkei Shearing Sports North Island Shearing and Woolhandling Championships in Marton on Saturday.