 He stayed in the North America for three more years, working at the University of California, Berkeley as an assistant research botanist and returned to India to join the Agricultural Biochemistry Section of Bhabha Atomic Research Center (BARC) as its head in 1972 where he worked till 1984.In between, receiving an Alexander von Humboldt Foundation fellowship, he spent one year at Ruhr University Bochum during 1979–80.In 1984, he became the director of the National Botanical Research Institute, Lucknow and held the post till his superannuation in 1997.