Elizabeth Traugott is Professor Emerita of Linguistics and English at Stanford University. Her many publications include Grammaticalization (1993 with Paul Hopper, revised ed. 2003), Regularity in Semantic Change (2002 with Richard Dasher), and Lexicalization and Language Change (2005 with Laurel Brinton).
Graeme Trousdale is senior lecturer in English Language at the University of Edinburgh. His publications include An Introduction to English Sociolinguistics (2010) and The Oxford Handbook of Construction Grammar (2013, co-edited with Thomas Hoffmann).