Cash, who has been chairman of the Manchester studio of BDP since 1994, will take up his new position with immediate effect. He will be based in Manchester, from where he will focus on the strategy to evolve BDP from a major European practice to a leading world design organisation.
Formed 47 years ago, BDP is the seventh largest practice of its kind in the world, despite only having three offices outside the UK, including its associate practice Groupe 6 in France.
The practice will seek, selectively, to grow its network of overseas offices. Initial target locations include new offices in Eastern Europe and in India. Earlier this year, BDP merged with Dutch urban planning specialists Khandekar.