Rajesh Kumar teaches linguistics in the Department of Humanities and Social Sciences at the Indian Institute of Technology Madras. He graduated with Ph.D. in linguistics from the University of Illinois at Urbana-Champaign. He has taught in the Department of Asian Studies at the University of Texas at Austin in the USA and IIT Kanpur, IIT Patna, and Tata Institute of Social Sciences in Mumbai in India. His book Syntax of Negation and Licensing of Negative Polarity Items was published by Routledge in their series Outstanding Dissertations in Linguistics. He has published papers in several journals and presented his work at professional meetings such as Annual Meeting of Linguistic Society of America and Chicago Linguistics Society among others. The broad goal of his research is to uncover regularities underlying both the form (what language is) and sociolinguistic functions (what language does) of natural languages. He has co-edited four books Linguistic Ecology of Mizoram, LinguisticFoundation of Identity, Language, Identity and Contemporary Society, and Text, Context and Construction of Identity with Om Prakash.Om Prakash teaches courses in the areas of Applied Linguistics, English Language Teaching, Communication Theories in Media, and Corporate Communication in the School of Humanities and Social Sciences at the Gautam Buddha University. He received his M.A., M.Phil., and Ph.D. in linguistics from University of Delhi. He has published in journals of national and international repute. He conducts workshops in language teaching and communication for school teachers. His broader areas of research include emerging fields in Applied Linguistics and an interface of Language, Media, and Contemporary Society. He seeks to explore changing forms and functions of language in the context of ever-emerging network society. He has edited a special issue on Language and Exclusion of the Journal of Exclusion Studies (February 2017 issue). He has co-edited four books Linguistic Ecology of Mizoram, Linguistic Foundation of Identity, Language, Identity and Contemporary Society, and Text, Context and Construction of Identity with Rajesh Kumar.