The recruitment exercise to appoint him, and a permanent CEO, cost £160,000.
His permanent successor, outgoing Belfast CEO Suzanne Wylie, will begin on 1 February. She will be the first woman to hold the top public sector job in Jersey.
In advance of her starting, handover meetings have been taking place, including virtually.

Pictured: Incoming CEO Suzanne Wylie.
As Mr Martin has annual leave to take before his contract officially ends on 28 February, his final day will be on Monday 31 January.
Before he goes, the Public Accounts Committee – a panel of politicians which oversees Government spending – will be questioning him.
They are now asking the public for question suggestions.
Islanders can send their suggestions to scrutiny@gov.je ahead of the hearing on Monday.