Toshiko Yamaguchi formerly taught at the Department of English Language at the University of Malaya, Kuala Lumpur, Malaysia. She holds a PhD in Japanese linguistics from Essex University, UK (1992-1999). She also holds two MAs: a MA in Applied Linguistics from NUS, Singapore (2005-2007) and a Magister Artium in English and German Studies from Heidelberg University, Germany (1987-1992). Before coming to Malaysia, she taught at the Department of Japanese Studies at NUS (1999-2003) and Center for Language Studies (2005-2007). Her current research interest is the analysis of Japanese English as an international language. In her earlier academic work, her focus was on the investigation of the Japanese language in terms of its synchronic and diachronic aspects. She has published two single-authored books (both in 2007) and co-authored edited volumes on Malaysian English (2016) and voices in in texts and contexts (2021).