an accomplished mathematician with extensive research contributions,in many areas of mathematics,including Ergodic theory,Dynamics,Number theory,Lie groups,and Measures on groups,published in many leading journals around the
world. After an illustrious career he retired from the Tata Institute of Fundamental Research (TIFR),Mumbai,in
2012,as Distinguished Professor. Subsequently he was affiliated with the Indian Institute of Technology (IIT)
Bombay for five years,and has recently joined the UM-DAE Centre for Basic Sciences,Mumbai.