Allen is an internal promotion, and started at Fonterra as a graduate in 2008.
Anna Molloy and Andrew Holmes take up board roles from April 4.
Lisa Small, Alysha Hinton, and Lisa McKeown were all appointed.
Judith Bullin, Joseph Morris, and Alex Summerlee have all been appointed.
Chris White confirmed as permanent CEO.
Treena Rowley and Megan Hodgson take on leadership roles.
Vittoria Shortt and Dan Huggins appointed to the roles.
Nicole Buisson was appointed and two members leave.
Associates Leesa Speed and Georgina Smith promoted.
Ports of Auckland sustainability GM Rosie Mercer joins Northland company.