In a statement the industry fund’s chief executive confirmed that Mary-Jane Fallon had resigned.
“I can confirm that Mary Jane Fallon has resigned from her position as chief investment officer,” Mr Rodwell-Ball said.
Mr Rodwell-Ball said that her duties had been assigned to other members of NGS Super team and an executive search was being carried out for her replacement.
Ms Fallon was previously CIO at the Energy Industries Superannuation Scheme.