Sumiyo Nishiguchi is an Associate Professor at the Center for Language Studies, Otaru University of Commerce. As a conference committee member of the English Linguistics Society of Japan, she has been leading the progressive field of linguistics since 2019. 

She holds a Ph.D. in Language and Culture (2010) and M.A. in English Linguistics (2003) from Osaka University, Japan, as well as an M.A. in Linguistics from the State University of New York, Stony Brook (2007). She has pursued research as a Junior Associate Professor at the Faculties of Science Division I and Management, Tokyo University of Science (since 2011), and as an Assistant Professor at the Center for International Cooperation in Engineering Education, University of Tokushima (since 2009). Her research interests include formal semantics, formal pragmatics and syntax. In the past 5 years, she has successfully accomplished a project with JSPS KAKANEHI on indexicality and negation in Dhaasanac and Somali languages. She is the author of 8 books and collected volumes and has published over 80 articles in national and international journals.