Dr. Balbir Singh Chhillar, an eminent scientist, teacher, extension specialist and successful administrator started his carrier as Asstt. Professor, 1971. He provided guidance and leadership as District Extension specialist, extension specialist (Entomology), Senior Co-ordinator in extension, Associate Dean (Post Graduate Studies), Professor and Head-cum-Director, Centre of Advanced Studies, Department of Entomology and presently, Director of Research, CCS HAU, Hisar. As researcher, he has provided technology for very effective biological control of sugarcane leaf hopper (pyrilla), established the cause of yellowing of sugarcane crop in post monsoon period and also established the bio control laboratory at co-operative sugar mill Sonipat (Haryana) A number of recommendations based on his research found place in the University package and practices like chemical control of sugarcane black bug, early shoot borer, root borer and grass hopper in sorghum and sugarcane crops. Associated in release of sugarcane varieties CoH 35, CoH 56, CoH 99 and CoH 108. Published 44 research papers, 46 popular articles, 5 mannuals, 11 course compendia, 8 technical bulletins and two books on entomology. Dr. Chhillar, decorated with Best Teacher Award (ICAR) in 2003-04 and guided 23 PG students (M.Sc. and Ph.D.). He visited to USA for advanced training on IPM, sugarcane.