Dr. Babatunde Osotimehin, a physician and public health expert, became the fourth Executive Director of UNFPA, the United Nations Population Fund on 1 January 2011. He holds the rank of Under-Secretary-General of the United Nations. Before this appointment, Dr. Osotimehin was Nigeria’s Minister of Health. Prior to that, he was Director-General of Nigeria’s National Agency for the Control of AIDS, which coordinates HIV and AIDS work in a country of about 180 million people.