He was known for his contributions in design of experiments as well as in multivariate analysis, survey sampling, reliability, coding theory, combinatorial theory, and other areas of statistics and mathematics.Srivastava code was invented by him.
Gödel's incompleteness theorems inspired him to recognize the limitations of science. He slowly turned toward spirituality and studied all the major religions of the world. This led him to obtain his 1991 joint appointment in the philosophy department of CSU.
After his retirement, he moved to California. He died on November 18, 2010. He is survived by his wife of sixty years Usha, son Arvind, daughter Gita and son-in-law Roy; son Ashok, daughter-in-law Lynn and granddaughter Leela.