Heiko Narrog is Professor at Tohoku University. He received a PhD in Japanese Studies from the Ruhr University Bochum in 1997, and a PhD in Language Studies from Tokyo University in 2002. He is the author of Modality in Japanese and the Layered Structure of the Clause (Benjamins, 2009), and Modality, Subjectivity, and Semantic Change: A Cross-Linguistic Perspective (OUP, 2012) as well as numerous articles in linguistic typology, semantics and language change, and Japanese linguistics.
Bernd Heine is Emeritus Professor at the Institute of African Studies, University of Cologne. He has held visiting professorships at universities across the world, including Guangdong University of Foreign Studies, La Trobe University, the University of Cape Town, Dartmouth College, and Universidade Federal Fluminense. His many publications include The Changing Languages of Europe (OUP, 2006) and The Genesis of Grammar: A Reconstruction (OUP, 2007), both with Tania Kuteva.
Bernd Heine and Heiko Narrog are co-editors of the OUP volumes The Oxford Handbook of Linguistic Analysis (2010; second edition 2015) and The Oxford Handbook of Grammaticalization (2010).