Dr. Rajat Acharya works as a Scientist at the Space Applications Centre, a unit of the Indian Space Research Organisation (ISRO). He is involved with the Indian Satellite Navigation program of GAGAN and IRNSS for more than a decade with pertinent contributions in ionospheric modelling. He is also a Faculty member at the Centre for Space Science and Technology Education - Asia Pacific, where he teaches on the M.Tech course on Satellite Communications and Satellite Navigation. He serves as a visiting Professor at Gujurat University, teaching on the PG Diploma course on Geo-informatics and Satellite Communications. He was also a member of the working group on models and algorithms from ISRO in the second meeting of the International Committee on Global Navigation Satellite System (ICG).