Prior to his appointment, Williams was Tasplan compliance and risk manager.
Tasplan chief executive Neil Cassidy said the process for the appointment was "rigorous and exhaustive and was conducted locally and interstate".
Cassidy said the appointment was crucial for the ongoing wellbeing of the fund.
"We are looking at reviewing our investment structure, which is always an ongoing process anyway, but now we have another person who can bring ideas and a fresh approach to the fund," Cassidy said.
As a result of Williams' appointment Tasplan's interview panel conducted another local and interstate search and appointed Greg Hanigan as the replacement compliance and risk manager.
Hanigan was a financial planner with Tasmanian Perpetual Trustees before joining Tasplan in early January.
Cassidy said the appointment reflected the increased commitment Tasplan was making to compliance and risk management.
"It is absolute high priority simply because of the licensing that we're under now. We've just gone through an Australian Prudential Regulation Authority review with a report to come soon," he said.
He said the two appointments "will bring a fresh approach to the overall management of Tasplan".
Tasplan has over $1 billion in assets under management and more than 100,000 members.