Omkar, FNASc, associated with teaching for about 36 years and research for 45 years, is a former head, Department of Zoology, University of Lucknow, and former coordinator, UGC-SAP (DRS-II), DST-FIST, DST-PURSE, Centre of Excellence, Government of UP Programs. He has worked on ten more projects of state/central funding agencies. He specializes in environmental toxicology and entomology, with particular reference to insect pest management. He is the chief editor of the Journal of Applied Bioscience; associate editor, International Journal of Tropical Insect Science; and president of the International Society of Applied Biology.

He has contributed to the following books as author/editor (14 books by reputed international publishers): Concepts of Toxicology (2017), Pesticides, Man & Biosphere (1998), Prof. S. B. Singh Commemoration Volume (2002), Experimental Animal Physiology & Biochemistry (2003), Modern Approaches to Insect Pest Management (2010), Kin Recognition and Oviposition Strategies in Aphidophagous Ladybirds (2012), Monitoring and Management of Mango Fruitfly (2012), Predaceous Ladybirds of Uttar Pradesh (2013), Ecofriendly Pest Management for Food Security (2016), Industrial Entomology (2017), Pests and Their Management (2018), Sucking Pests of Crops (2020), Polyphagous Pests of Crops (2021), Molecular Approaches for Sustainable Insect Pest Management (2021), Microbial Approaches for Insect Pest Management (2021), Reproductive Strategies in Insects (2022), Insects As Service Providers (2023), Parasitoids in Pest Management (2023), Insect Predators in Pest Management (2023), Commercial Insects (2024), Mosquitoes (2024, p. 422), Comprehensive Environmental Biology (2023), Concepts of Environmental Biology (2023), Environmental Pollution (2023), Biodiversity Conservation (2023), Mosquitoes: Biology, Pathogenicity & Management (2024), Flies: Agricultural & Public Heath Perspectives (2025), and Vish Vigyan Ki Avadharnayein (2025).

He has received several awards, including the Saraswati Samman from the Department of Higher Education, Government of UP; the Prof. T. N. Ananthakrishanan Foundation Award; the Rescholar Award of Excellence in Agricultural Entomology from the Association of Entomologists; the Prof. G. S. Shukla Gold Medal from the Academy of Environmental Biology; and the Dr. S. Pradhan Memorial Lecture Award from the Division of Entomology, Indian Agricultural Research Institute, and the Entomological Society of India, New Delhi. He has also received the ACCLAIM and Uddeepan awards from the University of Lucknow. He is a fellow of the Entomological Society of India, the Zoological Society of India, the Society for Biocontrol Advancement, and the National Academy of Sciences India (FNASc). He has authored 29 books and published 270 research papers, 16 reviews, 60 book chapters, and 20 popular science articles. He has guided 28 PhD students and visited the School of Biological Sciences at the University of East Anglia (2006) for three months and the Department of Zoology at the University of South Bohemia and the Czech Academy of Sciences, Ceske Budejovice, Czech Republic (May 2016) under INSA bilateral exchange programs.