Nwangwu's education continued at Erasmus University Medical School, in Rotterdam, The Netherlands where he completed his post-doctoral training.

[5][6][7] Between March 2013 and July 2014, Nwangwu consulted with WHO on the Ebola outbreak working on the ground in Guinea, Sierra Leone, and Liberia following the onset of the soon to be pandemic.

His hospital appointments include, Columbia Presbyterian Medical Center in New York City where he served as Director of the Tropical Disease Clinic, Director for Infection Control and Epidemiology at the VA Hospital in Rocky Hill Connecticut, and the Dana Farber Cancer Institute in Boston Massachusetts as a faculty visiting scholar.

[15] He joined the Kern County Health Department in California as the Chief Epidemiologist and then the Director of Epidemiology and Data Management.

[20][21] In addition, Nwangwu serves on the Board of a number of organizations including: MedSend,[22] the Overseas Ministries Study Center,[23][24] Faithcare Inc.,[25] Kateri Medical Services Inc.,[26] and Fanafi Worldwide.