From 2000 to 2002, he served as a senior technical advisor at the United States Agency for International DevelopmentBureau of Global Health.
[citation needed] He is a member of the Board of Global Health of the National Academies of Science, Engineering, and Medicine.
[4] From 2010 to 2013, Ratzan was the co-chair of Every Woman Every Child, a working group established by the United Nations to advance public healthcare for women and children.
[5] From 2018 to 2019, Ratzan was Senior Fellow in the Mossavar-Rahmani Center for Business & Government (M-RCBG) at Harvard Kennedy School.
[6] Ratzan is the executive director of Business Partners to CONVINCE, a USCIB initiative promoting vaccine acceptance globally.