The Rev Dr Selwyn Yeoman has resigned as master of Knox College due to health issues.
Dr Yeoman was appointed in November 2012, when the college was undergoing an extensive $12.1 million earthquake-strengthening and extension project.
Chairman of the Commission for Knox and Salmond College acknowledged the positive contribution that Dr Yeoman had made during his short tenure as the master.
''While his tenure has been shorter than expected, he has made a significant contribution to rebuilding a culture within Knox that is based on respect and Christian values.
''This is something the new master will continue once appointed. We fully support Selwyn's decision to focus on his health,'' he said.
The commission would begin recruitment of a new master shortly.
Until a replacement was found, the commission had appointed Maurie Jackways, who is head of neighbouring Salmond College, as acting Knox master.