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Ruqaiya Hasan, who died in 2015, was a professor of linguistics who taught and held visiting positions at various universities in England. Her last appointment was at Macquarie University, Australia, from where she retired as Emeritus Professor in 1994. Throughout her career she researched and published widely in the areas of verbal art, culture, context and text, text and texture, lexicogrammar and semantic variation. Read her obituary here

Professor Jonathan Webster is Honorary Professor at Macquarie University, and Professor at the City University of Hong Kong (retired). He was the Director of The Halliday Centre for Intelligent Applications of Language Studies (2005-2021), and Head of the Department of Chinese, Translation and Linguistics, City University of Hong Kong (2005-2011). Professor Jonathan Webster is the Founding Editor for Linguistics and the Human Sciences published by Equinox, and Managing Editor for WORD. Professor Jonathan Webster is also the Editor of 36 books on topics in Systemic Functional Linguistics.

Christian M.I.M. Matthiessen is a Swedish-born linguist and a leading figure in the systemic functional linguistics (SFL) school, having authored or co-authored more than 160 books, refereed journal articles, and papers in refereed conference proceedings, with contributions to three television programs. He is currently Distinguished Professor in the Department of Linguistics at University of International Business and Economics, Beijing, Distinguished Professor of Linguistics, in the School of Foreign Languages, Hunan University, Guest Professor at Beijing Science and Technology University, and Honorary Professor at the Australian National University. Before this, he was Chair Professor, Department of English, The Hong Kong Polytechnic University, and Professor in the Linguistics Department of Macquarie University. Professor Matthiessen has worked in areas as diverse as language typology, linguistics and computing, grammatical descriptions of various languages, grammar and discourse, healthcare communication studies, functional grammar for English-language teachers, text analysis and translation, multisemiotic studies, and the evolution of language. He has supervised over 40 research students.