Principal in 1869
Upon the death of Alexander Forrester in 1869, John Calkin was appointed Interim Principal of PNC. It appeared that Calkin would likely be appointed Principal, but instead, the government of the day appointed William Mulholland who had been teaching Mathematics.
It wasn’t long before there were complaints from the students about Mulholland’s leadership and behaviour. These concerns were sent to the government and an inquiry was established which resulted in Mulholland’s removal from the position and the permanent appointment of Calkin as Principal. He remained in that office from 1869 to 1900.