NATO Secretary General: Role and Responsibilities (nato.int)

• Chairs the North Atlantic Council and other decision-making bodies
• Facilitates consensus and mediates disputes among member states
• Serves as principal spokesperson and head of the International Staff

"The NATO Secretary General is the Alliance's top international civil servant, steering consultation and decision-making. They chair the North Atlantic Council and other senior committees, facilitate consensus, act as chief spokesperson, and oversee the International Staff. Appointed for four years, traditionally from a European member country."