Editorial Service:

(2021-Present) Editorial Advisory Board Member, Dependence Modeling.
(2015-Present) Associate Editor, Annals of the Institute of Statistical Mathematics.
(2016-2017) Associate Editor, (2017-2018) Editor-in-Chief, Proceeding of the Institute of Statistical Mathematics.
(2012-2016) Associate Editor, Statistical Methodology.

Research Visits:

The Open University, UK. Conducted joint work with Professor M.C. Jones.
The University of Chicago, USA. Conducted joint work with Professor Peter McCullagh.
University of Extremadura, Spain. Conducted joint research with Dr. Arthur Pewsey.

Research Achievement Prize (2015)

Awarded by the Japan Statistical Society for outstanding contributions in research in the fields of statistics and related areas.
Excellent Paper Award for Young Researcher (2009)

The paper "The Generalized t-Distribution on the Circle" (Siew, Kato and Shimizu, 2008) has been selected as the excellent paper for young researcher among the papers published in the Japanese Journal of Applied Statistics in 2008.
Excellent Paper Award (2007)

The presented paper "A Markov Process for Circular Data" has been awarded the best paper in the Student Paper Competition held at IMST2007 FIM XV International Conference on Interdisciplinary Mathematical & Statistical Techniques, Shanghai, China.
Outstanding Student Paper Award (2006)

The presented paper "A Bivariate Circular Distribution With Uniform Marginals" has been awarded the outstanding paper in the Student Paper Competition held at SCRA2006 FIM XIII International Conference on Interdisciplinary Mathematical & Statistical Techniques, Lisbon, Portugal.