- 2010 - 現在 Rissho University Faculty of Economics
- 2010 - 現在 Professor of Rissho University, Faculty of Economics in Tokyo
- 2014/07 - 2016/09 Alexander von Humboldt Foundation Research Fellow (Guest) (Jul.-Sep.2014, Jul.-Sep.2015, Jul.-Sep.2016)
- 2012/04 - 2016/03 国立国語研究所共同研究プロジェクト「コーパス日本語学の創成」共同研究員
- 2012/04 - 2016/03 Joint researcher of the Collaborative Research Projects "Basic Research on Corpus Annotation" by the National Institute for Japanese Language and Linguistics
- 2010/04 - 2015/03 Tokyo Woman's Christian University College of Arts and Sciences
- 2010/04 - 2015/03 Part-time Lecturer of Tokyo Woman's Christian University in Tokyo
- 2007 - 2012 Aoyama Gakuin Women's Junior College
- 2007 - 2012 Part-time Lecturer of Aoyama Women's Junior College in Tokyo
- 2010 - 2011 Saitama Gakuen University Faculty of Humanity
- 2010 - 2011 Part-time Lecturer of Saitama Gakuen University in Saitama
- 2009 - 2010 Saitama Gakuen University Faculty of Humanity, Department of Human Cultures
- 2009 - 2010 Professor of Saitama Gakuen University, Faculty of Humanities in Saitama
- 2004 - 2010 Hosei University
- 2004 - 2010 Part-time Lecturer of Hosei University in Tokyo
- 2008 - 2009 Nihon University College of Humanities and Sciences
- 2008 - 2009 Part-time Lecturer of Nihon University in Tokyo
- 2007 - 2009 Saitama Gakuen University Faculty of Humanity, Department of Human Cultures
- 2005 - 2009 Assiciate Professor of Saitama Gakuen University, Faculty of Humanities in Saitama
- 2002 - 2009 Rissho University
- 2002 - 2009 Part-time Lecturer of Rissho University in Tokyo
- 2005 - 2008 Meikai University
- 2005 - 2008 Part-time Lecturer of Meikai University in Chiba
- 2005 - 2007 Saitama Gakuen University Faculty of Humanity, Department of Human Cultures
- 2000 - 2006 Tokyo Gakugei University
- 2000 - 2006 Part-time Lecturer of Tokyo Gakugei University in Tokyo
- 2004 - 2005 Komazawa Junior College
- 2004 - 2005 Part-time Lecturer of Komazawa Junior College in Tokyo
- 2003 - 2005 Surugadai University
- 2003 - 2005 Part-time Lecturer of Surugadai University in Saitama
- 1998 - 2005 Tsuru University
- 1998 - 2005 Part-time Lecturer of Tsuru University in Yamanashi
- 1995 - 1998 日本学術振興会・特別研究員(PD)研究課題「基本的語彙群における語の交替についての計量的研究」
- 1995 - 1998 JSPS (Japan Society for the Promotion of Science) Research Fellowship (PD)
- 1993 - DAAD(ドイツ学術交流会)短期奨学生としてTrier大学計量言語学科・Bochum大学言語研究所に研究滞在
- 1993 - DAAD(Deutscher Akademischer Austausch Dienst) Graduate Scholarship Student for Short Project Research in Trier University, Department of Quantitative Linguistics and Bochum University, Institute of Linguistics
- 1985 - 1990 日本アイ・ビー・エム(株)システムズ・エンジニア
- 1985 - 1990 Systems engineer at IBM Japan, Ltd.
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JAPANESE ASSOCIATION OF THE SOCIOLINGUISTIC SCIENCES
, 語彙研究会
, 情報処理学会・人文科学とコンピュータ研究会
, 近代語研究会
, International Quantitative Linguistics Association
, 計量国語学会
, 日本語学会(旧国語学会)
, Society for the study of vocabulary
, Special Interest Group of Computers and the Humanities
, Information Processing Society of Japan
, Society for the study of modern Japanese
, International Quantitative Linguistics Association
, Mathematical Linguistic Society in Japan
, Society for Japanse Linguistics