ChristchurchNZ says the appointments will drive strategic investment and sector productivity, ahead of a bumper major events calendar.
Jeffrey Clarke has been appointed as chief executive after being interim CEO since April.
Jonathan Gillard is a senior partner at the firm.
Effective from September 1, Mark Chellew joins Downer as an independent director and chair-elect.
Clarke Hill brings more than a decade of experience.
Ravinesh Kumaran is the general manager of GMP Pharmaceuticals.
Matt Kum fills newly created national sales manager - airport role; David Carran joins as senior account director.
The appointment of Alice Balme and Mike Doesburg is in response to ‘growing needs of clients’.
Nina Blomfield and Tara Wylie’s promotions are effective from July 1, 2021.
Lain Jager and Ken Forrest are the new independent directors on the board.