Wrenn will leave in August, however the RIAS has said no replacement will be appointed until the latter part of the autumn.   

In her role as chief executive Wrenn said she was pleased to have been a "catalyst for change" in the RIAS, taking the lead in creating a new corporate identity, developing a 5-year Strategic Plan and consolidating the RIAS's financial position.

The RIAS president, Arnie Dunn, of Edinburgh practice Campbell + Arnott, said: "We are sorry to be losing Mary. She has successfully led the Incorporation through a crucial phase in its development by setting the RIAS on the path to longer-term governance reform. She has re-introduced the competitions unit and taken the RIAS Andrew Doolan Award to new heights. Her dedication to developing the RIAS staff team has been particularly welcome."