Wood was New Zealand's Ambassador to Iran in 1987, and the first ambassador to Turkey in 1989. He was also high commissioner to Pakistan. In 1991 he became Deputy Secretary of Foreign Affairs, responsible for trade and economic policy, and one of the key officials driving New Zealand's role in Asia-Pacific Economic Cooperation (APEC), and the World Trade Organization (WTO). Wood headed New Zealand delegations and negotiations to the WTO Ministerial meetings in Seattle in 1999, and Doha in 2001. He was inducted into the Consumers for World Trade Hall of Fame for his services in the promotion of free trade.