In early 2008, Lahariya joined the World Health Organization in India, where - in the years which followed - he coordinated the organization's work on the new vaccines introduced in the country. [3][4]
In October 2020, in a study conducted by Stanford University and published in the reputed PLoS Biology, Lahariya was listed amongst the top 2% of researchers globally, in the fields of pediatrics and public health.[6] He was, once again, included in the list of Top 2% researcher globally, in 2021. [7]
In 2009-10, Lahariya was the guest editor (along with Dr Vinod Kumar Paul, then Professor of pediatrics at AIIMS, New Delhi and now Member of NITI Aayog, Govt. of India) of a special series on child survival in India.[9][10][11] This series was published in the Indian Journal of Pediatrics and had contributions from leading Indian health experts including Prema Ramachandran, Deoki Nandan, Prasanna K. Hota, and Shiv Lal. Lahariya who had co-authored a few articles, including one with Dr Vinod Kumar Paul of NITI Aayog.[12]