Former United Nations secretary-general and Nobel Peace Prize winner Kofi Annan has died at the age of 80. He played a key role in modernizing the way the United Nations responded to crises like the HIV/AIDS pandemic, the Iraq War and climate change. By reforming the UN, he stabilized the financial situation of the institutions on the brink of bankruptcy. Annan, who passed away on Saturday, was the first black African to lead the United Nations, becoming one of the most enduring and recognized diplomats in modern history.