Dr. J.S. Grewal was born on 8th February, 1928 at Gaddowal Village, District Ludhiana (Punjab). He did B.Sc. (Ag.) from Punjab and Ph.D. in Botany from Allahabad under the guidance of Prof. R.N. Tandon. He served the Division of Plant Pathology, IARI, New Delhi in various capacities as Research Assistant, Assistant Plant Pathologist, Senior Pathologist and Principal Scientist. He also served as Head, Division of Plant Pathology, IARI from March 1986 to February 1988. Dr. Grewal served the Indian Phytopathological Society as Editor (1977-79) and President (1987). He guided 15 students for their M.Sc. and Ph.D. degrees.
Dr. Grewals specialization was on diseases of pulse crops and he publishes more than 200 papers in national and international journals. He visited U.K. for training in fungicides during 1962; Taiwan in 1977 for International Symposium on Mungbean and also visited ICARDA, Syria in 1981 for International Symposium on winter sowing of chickpea.
He passed away for his heavenly abode in February 18, 2008.