 He is currently a commissioner of the World Health Organization (WHO) Commission on Social Determinants of Health and a recognized expert on pediatric and neonatal health issues.Of his major contributions, was a highly successful national vaccination program (which also included a program for terminating polio in Iran), the significant reduction of infant and child mortality rates, as well as organizing one of the most successful national birth control programs in the World.Marandi was elected as an MP from the city of Tehran in the 2008 Iranian parliamentary elections in which around 1,700 candidates were barred from running by the Guardian Council vetting body, the Supervisory and Executive Election Boards.