The United Nations is again choosing a Secretary-General, making the question of what leadership the office requires more than theoretical. The answer is uncomfortable: the qualities that matter most are least visible at appointment, and several are precisely what a process built around great-power acceptability tends to screen out. The UN may select against the leadership it most needs.
Trygve Lie greeted his successor Dag Hammarskjöld “to the most impossible job on this earth”. A paradox is embedded in the office: expected to lead globally, yet constrained in its capacity to act. As Kofi Annan put it, the SG is “sort of a referee, but without red and yellow cards”.
The Charter provides no enforcement powers, no independent budgetary authority and no binding authority over Member States. Article 99 lets the SG raise the alarm before the Security Council, not compel a response. The office is power-poor but authority-rich: it lacks coercion, yet carries moral authority few offices match.
Worse, two of its central roles pull against each other. Diplomacy requires access to all parties, including those whose conduct is questionable; moral authority requires taking positions on what the Charter demands. Speaking out costs access, silence costs credibility, and the SG navigates that in real time with few mechanisms for resolution.
To picture the Secretary-General “charming” the great powers is to imagine charisma as a superpower. Since Weber, it has been understood not as a possession of the leader but as authority that must be recognised and granted by followers. Its value is working within constraints, not overpowering them: the SG cannot force states to act, but can alter the frame through which inaction is understood.
In the 1954–55 crisis over American airmen held by China, the General Assembly asked Hammarskjöld to act “in the name of the United Nations”; Beijing rejected the resolution. He recast his role, going as Secretary-General under the Charter, not the Assembly’s emissary. The resulting “Peking Formula” came to stand for an affirmative obligation, not merely a right, to act when peace was threatened. This was not why he was selected: he appeared safe at appointment, his independence recognised in hindsight.
Annan projected the same capacity outward as moral authority, giving the UN a usable language: a “culture of prevention”, “sovereignty as responsibility”, the Millennium Development Goals. He compelled no state to act, but changed the frame in which inaction had to be defended.
Circumstance is the obvious objection: Hammarskjöld had decolonisation, Annan the aftermath of Rwanda and Srebrenica. But context does not explain everything. Hammarskjöld faced Cold War paralysis and still expanded the office; Ban Ki-moon, facing no comparable threat, was more cautious. Similar constraints, different outcomes.
This matters as the UN’s role in peacemaking narrows: data reproduced by The Economist show its role as third-party mediator declining from a post-Cold War peak. No SG’s charisma caused that. But if the UN is no longer automatically invited in, the SG must make the office hard to exclude.
The costs are not theoretical. Hammarskjöld’s independence over the Congo provoked a Soviet proposal to replace the single Secretary-General with a three-person Troika. Boutros-Ghali’s assertiveness drew a US veto – the only SG denied a second term. Initiative is not fearlessness; the competence is judging how far the office can move before overreaching.
Charisma’s limits are harder still: it may not move the P5 when core interests are engaged, and can become polarising. It wins a hearing; what is done with it is another problem.
Adaptive leadership, developed by Ronald Heifetz with Alexander Grashow and Marty Linsky, begins from the premise that authority and leadership differ. Technical problems yield to existing expertise; adaptive challenges require people to learn, revise assumptions and absorb losses. The hardest issues before the SG – armed conflict, climate action, development financing, Council deadlock, declining trust in multilateralism – are adaptive: problem, solution and responsibility are contested.
Misdiagnosis is a recurring failure. Treating an adaptive challenge as technical rearranges furniture in a burning room: the appearance of action, deeper loyalties untouched.
The alternative is harder. The SG leads among Member States, not above them: asking hard questions, convening and persuading, while leaving responsibility with those whose choices must change. The successful SG is not the centre of the story, but the one who helps the system do work it would avoid.
Together, the frameworks suggest what to look for: moral and communicative framing, diagnostic judgement, adaptive initiative, steadiness under distress, willingness to give the work back rather than seize it. Framing and reasoning show in how a candidate speaks; judgement and steadiness are far harder to assess in advance.
So long as the P5 and the wider membership want fundamentally different things from the United Nations – so long as that gap is not a problem to be solved but a condition the office must work within – no degree of charisma, and no measure of adaptive skill, will turn the Secretary-General into something the office was never designed to be.
Charisma can win a hearing; adaptive leadership can turn that hearing into shared work. Neither can close the gap that makes the role impossible in the first place. What the right Secretary-General can do is lead from inside that impossibility: with little power, but with the responsibility to use what the office does have -voice, judgement, and the patience to keep the work where it belongs: with the Member States whose choices determine what the United Nations can ultimately do.
This article draws on the author’s MAS thesis, “Leading Without Power: Charismatic and Adaptive Leadership in the Office of the United Nations Secretary-General”, in which full references and a bibliography can be found.
