Who has been the head of NATO since 2014?

Jens Stoltenberg has been the head of NATO since 2014, serving as the Secretary General of the organization. His leadership began following his appointment to the position, which involves overseeing NATO's strategic direction, political decision-making, and operations. Stoltenberg, a former Prime Minister of Norway, has played a significant role in shaping NATO's responses to various global security challenges, including the increased tensions with Russia and the need for collective defense initiatives. His experience in politics and international relations makes him well-suited for this position, allowing him to effectively advocate for NATO's interests and enhance member cooperation.

The other names listed do not hold the position of NATO Secretary General; rather, they have had roles in different capacities in their respective countries or organizations.