The National Theatre's first chief executive, Tessa Ross, has resigned after five months at the organisation, but will continue to work with the charity as a consultant.

Ross was appointed last year to work with new director Rufus Norris as part of a proposed shake-up in the organisational structure. She joined the organisation in November and was due to formally take up the role of chief executive this month.

In a statement Ross said: “It has become clear to me that the new leadership structure with a separate role of chief executive, is not right for the NT at this time, and so I have decided to step down.”

“I will, with great pleasure, continue to work with Rufus [Norris] and Lisa [Burger] as a consultant, ensuring the smooth delivery of their first season and planning for the next one. It is an institution that I love and for which it has been a great privilege to work."

The National Theatre said Norris will continue to lead as the director with Lisa Burger as executive director. Burger became executive director in November 2014, having previously been the organisation's chief operating officer. 

John Makinson, chair of the National Theatre, said: “It is with great regret that we are saying goodbye to Tessa in this role. She is an outstanding producer and executive and has already made a significant contribution to the National. However, we recognise and salute the integrity of her decision.

“The NT has a strong team in place under the capable and skilful leadership of Rufus and Lisa. The National Theatre is in very good hands.”

Norris said Ross’s work at the theatre and her role in the planning of his first year and beyond had been “invaluable and immense”.

“I’m sad that our partnership is ending prematurely but am grateful for everything she has done here, and happy that we’ll work together on a consultancy basis. As I continue to steer this extraordinary powerhouse, I look forward to working in close partnership with Lisa Burger as together we build on our plans for the National’s future.”