He has worked for the Berlin-based anti-corruption organisation four years. He was previously finance director of Oxfam between 1997 and 2003.
Nussbaum also holds non-executive directorships with the Shared Interest Society, a fair trade finance organisation, and Low Carbon Accelerator, a private equity fund that invests in technology-based companies that contribute to a low-carbon economy.
“Through WWF’s network around the world, it is well placed to engage with globalisation and the growing significance of all kinds of international interactions,” said Nussbaum. “Here in the UK, it has an influential role to play in its relationships with government, companies and citizens.”
He succeeds, Robert Napier, who retires after eight years at the helm and will concentrate on his role as chairman of the Met Office.