• April - August 1990
  Research Fellow -DC, Kumamoto University
  Japanese Society for the Promotion of Science
  
• Sept 1990 - Jan 1994; June 1994 - June 1996
  Research Assistant
  Massachusetts Institute of Technology
  
• Feb - May 1994
  Teaching Assistant (Analysis of Geological Material)
  Massachusetts Institute of Technology
  
• August 1996 - September 1997
  Center of Excellence Fellow
  National Institute for Research in Inorganic Materials
  
• October 1997 - September 1999
  Lecturer, Faculty of Science, Niigata University
  
• October 1999 - present
  Associate Professor, Faculty of Science, Niigata University
  

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