Adrian Boulding is set to step down from his role as Legal and General’s pensions strategy director in August.
He has been with the provider for 18 years, helping to steer the firm’s pension policy and strategy.
Outside of his main job, Mr Boulding is also chairman of the defined contribution kitemark Pension Quality Mark and was also a member of both the current government’s independent auto-enrolment review and the previous Labour government’s stakeholder advisory group.
A spokeswoman confirmed Mr Boulding’s departure by mutual consent, but could not comment any further.
The departure follows that of Wadham Downing, director of strategy and mergers and acquisitions, who resigned at the end of December and is due to leave by the end of June.
At the end of November, the group announced major changes to the structure of its insurance, corporate and savings divisions, aimed at increasing the scale of its long-term businesses, reducing costs and delivering enhanced value for shareholders and customers.
The moves followed executive director and chief executive John Pollock stating his intention to step down from the board at the annual general meeting on 21 May 2015, with no direct replacement being sought.