left at the end of an 18-month term, stating that he was disappointed by the international community's "failure to acknowledge the fact that we have in Haiti the largest epidemic in the western hemisphere." Nabarro's efforts were no more successful—as a result of a lack of support from the UN Secretary General and from member states, Nabarro was only able to raise $2.7 million of the promised $400 million before being replaced by Josette Sheeran—though Sheeran would face the same obstacles as Nabarro. Special adviser on Sustainable Development and Climate Change (2016–2017) In January 2016, Nabarro was appointed special adviser on the 2030 Agenda for Sustainable Development by then UN Secretary-General Ban Ki-moon. One of Nabarro's responsibilities in this role were to lead the UN's response to the cholera epidemic its peacekeepers sparked in Haiti in October 2010 when untreated, infected sewage from a UN base was deposited in the country's main river system. As of August 2016, at least 10,000 people had died and more than 800,000 have been sickened in the epidemic. Candidate for WHO Director-General (2016–2017) In September 2016, Nabarro was nominated by the UK's First May ministry to stand for the post of director-general (DG) of the World Health Organization (WHO). An article co-authored by the UK's chief medical officer, Sally Davies, was published in The Lancet. It outlined the criteria that the next DG of the WHO must fulfill. Nabarro was one of six candidates put forward by their individual governments to succeed DGWHO Margaret Chan. Nabarro outlined his four priorities as follows: Alignment with the Sustainable Development Goals Transforming the WHO to respond to outbreaks and health emergencies Trusted engagement with Member States Advancing people-centred health policies. On Tuesday 23 May, at the 70th World Health Assembly, Nabarro came second in the race to become the next director general, receiving 50 votes to Dr Tedros Adhanom's 133 in the third and final round of voting. Imperial College London Professor (2018–present) In 2018 he was appointed Professor at the Institute of Global Health Innovation at Imperial College London and then appointed in 2019 as Co-Director with surgeon Ara Darzi, Baron Darzi of Denham. COVID-19 pandemic On 21 February 2020, he was appointed as one of six Special Envoys from the DGWHO, who were tasked to respond to the COVID-19 pandemic. In October 2020, Nabarro gave an interview with The Spectator on YouTube in which he