Prof. UR Rao was instrumental in developing space applications, launch vehicle technology, cryogenic engine project, space science missions of Indian space program. He was also instrumental in setting up ISRO's commercial arm Antrix Corporation[0], which provides space application and launch services worldwide and generate revenue for ISRO. Most recently, he was laying out plans for ISRO's Venus mission. Now, payload selection is going on for Venus mission[1]. Before coming back to India, Rao was one of the prime experimenters of NASA's Mariner 2, Pioneer 6/7/8/9, and Explorer 34/41 missions. Godspeed, and rest in peace.
These are some interesting interviews of Prof. UR Rao:
https://www.youtube.com/watch?v=fiJ1yRrNRO8
https://www.youtube.com/watch?v=k6aZXl-eLEQ
ISRO's tribute to Prof UR Rao: http://www.isro.gov.in/update/28-jul-2017/tribute-to-prof-u-...
[0] http://www.antrix.gov.in/
[1] http://www.firstpost.com/tech/news-analysis/isro-mission-to-...