Kees Hengeveld has been active in Functional Grammar for over twenty years. He is the author of Non-verbal Predication: theory, typology, diachrony (Berlin, 1992) and editor of Simon Dik's two-volume The Theory of Functional Grammar (Berlin, 1997). He is Professor of Theoretical Linguistics at the University of Amsterdam.
J. Lachlan Mackenzie has worked with Functional Grammar since his appointment in 1977 to the Vrije Universiteit Amsterdam, where he is now Honorary Professor of Functional Linguistics. He is co-editor of Crucial Readings in Functional Grammar and of A New Architecture for Functional Grammar (Berlin, 2004 and 2005).