No reason was given for Hockly's departure, who has been in the top job since 2019.
Sarah Russell beat more than 200 global applicants for the job.
Experienced director Mary-Jane Daly will replace John Minto in the new year.
The Icehouse strengthens board with new members Duncan McFarlane, Rewa Willis, and Mark Synnott.
Lauren Quaintance was appointed to the board in 2023 and has been the deputy chair as well as chair of the People and Culture Committee.
Lauren Rapley and Jeremy Upson have been made partners of the firm.
Peter Ambrose is a full-time property investor, property coach, and property finder.
Sam Friggens started in his new role at ASB on October 29.
Roger Cronin takes on the newly created role of chief operating officer for its 10 wholly owned hospitals.
Nick Flack will commence in his new role from February 3, 2025.