Head of Datacom's software-as-a-service business steps into the top local job in October.
Errol Burn will continue as director and head of assurance as well as taking on the MD role.
Brian Fouhy fills the role vacated in August by Troy Kennedy, now CEO.
McKinnon has been acting CEO from earlier this year.
The appointments are aimed at driving its international expansion strategy.
David Chin has been appointed to lead the farmer-owned co-operative.
Anne Wilson has moved, with her family, to Christchurch to join the firm.
Dean Barker will replace company founder Iain Hosie.
Evan Bateup will join the firm from December 6.
Tony Giles was formerly the New Zealand Dairy Goat Co-operative chief executive.
