Dr. Sadik was Executive Director, with the rank of Under-Secretary General, of the United Nations Population Fund (UNFPA) from 1987 to 2000. An obstetrician-gynecologist by training, Dr. Sadik has a distinguished career which has included work as a Civilian Medical Officer in Pakistan, as the Director of the Pakistan Central Family Planning Council, and in various senior capacities at UNFPA. She was Secretary-General of the ICPD.

Dr. Sadik is widely published in the family planning, health, population and development fields and has edited several books, including Making a Difference: Twenty-five Years of UNFPA Experience.

She is the recipient of numerous awards bestowed by His Excellency President Hosni Mubarak of the Arab Republic of Egypt, The Royal College of Obstetricians and Gynecologists, the National Wildlife Federation, the American Public Health Association and the International Union for the Scientific Study of Population, among others.

Dr. Sadik is currently a Special Advisor to the Secretary-General of the United Nations and Special Envoy for HIV/AIDS in Asia and the Pacific.