The race to become the next leader of the United Nations on July 25 added a seventh candidate: Uganda’s Olara Otunnu, a former opposition presidential candidate and onetime high-ranking U.N. official.

Four women and two men are competing to lead the UN as it faces wars, budget woes and reform calls. Learn who they are and what their candidacies mean.

The six candidates vying to replace the outgoing head of the United Nations, Antonio Guterres, were grilled by diplomats, UN employees and civil society representatives on…