| 1983-1984 |
Undergraduate Research Assistant, Dept. of Agriculture, Tokyo University of Agriculture, and National Research Institute of Brewing. |
| 1984-1986 |
Graduate student, Dept. of Fermentation Chemistry, Yamanashi University. |
| 1986-1991 |
Researcher, Central Laboratory of Kurita Water Industries Ltd. |
| 1987-1990 |
Visiting research associate, The Institute of Physical and Chemical Research (RIKEN Institute). |
| 1991-1993 |
Ph.D. student, Dept. of Bioscience and Biotechnology, Tokyo Institute of Technology. |
| 1993-1995 |
Post Doctoral Fellow, Michigan State University, Center for Microbial Ecology. |
| 1995-2001 |
Research associate, Deep-sea Microorganisms Research Group, Japan Marine Science and Technology Center. |
| 1997-1998 |
Visiting research associate, Nara Institute of Science and Technology. |
| 2001- |
Group leader of Microbial Genome Research Group, Japan Marine Science and Technology Center. |
| 2002-2003 |
Visiting scientist, Scripps Institution of Oceanography, UC San Diego. |
| 2006-2009 |
Program director of extremophiles research program, Japan Agency for Marine-Earth Science and Technology. |
| 2006- |
Visiting professor of Azabu University, School of Veterinary Medicine. |
| 2009- |
Team leader of environmental metagenome research group |