One of only two civil servants on the island, Michael Bertram had only been in position since last July.
A short statement from Chief Pleas said that Mr Bertram had decided to step down with ‘immediate effect’.
‘Michael joined the Chief Pleas of Sark in the newly-formed role last July, having moved to the island from his previous position in Tristan da Cunha,’ a spokesman said.
‘The Policy & Finance Committee wishes Michael all the best with his future plans. In the meantime, the committee will consider the best way forward and begin the process of recruiting a successor.’
Sources on the island said that Mr Bertram, who has a doctorate in public administration, did not resign from the role, but had been ‘quietly removed’ by senior figures.
There has been disquiet on the island since P&F chairman John Guille asked the States of Guernsey for a £1.5m. loan to purchase the island’s private power company and overhaul the island’s electricity grid.
The owner of Sark Electricity Company has previously said he would fight any compulsory purchase order issued on the company.
Conseillers on the island have also called in to question conditions surrounding the loan, which they said raised questions over the island’s self-governance.
Four of the conseillers took the step of writing to all 38 Guernsey deputies raising concerns over the loan’s structure and a lack of transparency.
The loan was due to be discussed in the States this week, but a debate on the subject has been postponed until the final sitting of the term, which begins at the end of this month.
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