The chairman of the National Landlords Association (NLA) David Salusbury has welcomed back Barry Markham to the group's board of directors with "great pleasure".
According to Mr Salusbury, the director's "many years of experience" will benefit the organisation and its members.
Mr Markham became a NLA director in July 2008 at the time of the merger between the NLA and the Southern Private Landlords Association (SPLA), but resigned four months later due to legal challenges related to the collaboration.
In May this year, the High Court dismissed all legal challenges to the arrangement, allowing the director to return to his post.
The NLA chairman said it was it was vital that SPLA directors responsible for decisions about the merger could defend their actions.
"Now that the High Court has made its decision, we can put past difficulties behind us and move on," he added.
At the time, Mr Salusbury said it was "a relief" that the episode was all over.
Written by Claire Doyle