H.E. Ranganathan has served in Myanmar as the second in command at the Embassy of India, Yangon. Her other overseas postings were in Ankara and Hong Kong.

H.E. Ranganathan has extensive experience in headquarters, having served in various capacities in the Ministry of External Affairs as well as in the Department of Commerce and Industry. In the Ministry of External Affairs, H.E. Ranganathan has served in the Administration, Europe West and Disarmament & International Security Affairs Divisions. She has earlier served as Joint Secretary (Director General) of the SAARC Division and, most recently of the Bangladesh and Myanmar Division.

In the course of her secondment to the Department of Commerce, H.E. Ranganathan served in the Export Promotion (Agricultural Products & the Trade Policy Divisions).

H.E. Ranganathan speaks Tamil, Hindi, and English and has some knowledge of Turkish. Her interests include reading, traveling, yoga, and music

H.E. Ranganathan is married to Mukund Santhanam, a banker. They have one daughter.