The hunt is on at Channel 4 for a director to replace Tony Hall, who stood down as deputy chairman to become director general of the BBC.
Channel 4's board members are chosen by the media regulator Ofcom. It has advertised for "candidates with senior level broadcasting and editorial experience".
Ofcom said "Channel 4 faces a demanding agenda" and it would like to attract "applicants of high calibre, intellect and integrity".
Lord Hall, a former Royal Opera House chief executive, was appointed to the non-executive position at Channel 4 last year.
His replacement may not take on his role as deputy chairman. Depending on the recruit the current board could be reorganised.
Lord Hall's replacement would work with the chairman, Lord Burns, who joined the executive board in 2010 and last year was appointed to a second three-year term until 2016.
Other non-executive directors at Channel 4 include Mark Price, managing director of Waitrose, and Josie Rourke, artistic director of the Donmar Warehouse theatre.
The broadcaster has recently lost its chief operating officer. Lord Hall persuaded Anne Bulford to leave Channel 4 to join him at the BBC as managing director, finance and operations.
Channel 4 faces increasing pressures on costs as advertising revenue is hit by online competition. It relies on advertising for its revenues of nearly £1bn a year.