The Rehab Group has appointed a new Board of 16 people and has introduced governance changes.
The move was approved today at the group's Annual General Meeting.
Thirteen of the Board members are newly appointed.
The board members are drawn from the charity, public, and private sectors and will receive no remuneration for their work.
Board chairman, Sean Egan said the Rehab Group has formally committed to adopting the Fundraising Code for Charities and the Governance Code for voluntary organisations in Ireland.
The process to appoint a new Chief Executive is also well advanced.
It follows controversies over State funding, its charity lotteries scheme and clashes with the Public Accounts Committee.
In April, its chief executive Angela Kerins retired and former Board member, Frank Flannery also stepped down in March.
Management consultant, Dr Eddie Molloy was asked to lead a review of the group.