The move is expected to take place by the end of November.
Ingham will replace Patrick Barrow as director general and MD. Barrow recently left the PRCA to take charge of Ketchum’s UK corporate practice.
Ingham said he wanted people to recognise the contribution agencies make to British industry: ‘Some consultancies don’t understand how essential they are to business. Consultancies are the intellectual powerhouses of our industry and they need a cheerleader.’