He is known for his research in public health, poverty, and, and family planning (particularly, Acquired Immunodeficiency Syndrome), and human population.
He then moved to Australia to pursues his master's degree from the Australian National University in Population and Development.
[2][3] After completing his PhD, Zulu moved to Nairobi, Kenya to do a post-doctoral fellowship at the African Population and Health Research Center (APHRC), an organization founded by the Rockefeller Foundation.
Through the organization, he has been influencing data-driven policy in Kenya, Malawi, Uganda, Democratic Republic of Congo, Zambia and other nations on the continent.
[3] The organization won the United Nations Population Fund award in 2023 for its impact on maternal health, sexual reproduction, and family planning in Africa.