Ashe led negotiations on budgetary and administrative matters within the conventions on biological diversity and desertification, the Basel Convention and the Montreal Protocol. He served on the Executive Boards of the United Nations Development Programme (UNDP)/United Nations Population Fund (UNFPA) and the United Nations Children's Fund (UNICEF). He was also his country’s ambassador to the World Trade Organization (WTO) and had ministerial responsibility for WTO and sustainable development matters.