Abstract　 　　
　Dr.Matsuoka is a senior advisor of RIKEN (the Institute of Physical and Chemical Research) since 2010. He is an experimental and observational researcher of astrophysics based on X-ray astronomy (all fields of Xray astronomy) since 1963. He has published about 300 papers on X-ray objects using balloon, rockets, and Asca,satellites,Hakucho, Tenma, Ginga, HETE & Suzaku as well as MAXI. He is a science project manager in JAXA and RIKEN of MAXI since 1997. He got his PhD from Nagoya University in 1966. His career is as followings; Director of Cosmic Radiation Laboratory of RIKEN from 1986 to 1999. Professor of ISAS and Tokyo University, 1975 to 1986.

　 Monitor of All-sky X-ray Image (MAXI) is an X-ray all-sky monitor, to scan almost the entire sky once every 96 minutes as the International Space Station (ISS) orbits Earth. MAXI on ISS has been observing the X-ray sky from Aug 2009 for a mission life of more than two years. Besides the goal of performing a complete sky survey, this research helps to address fundamental astrophysics questions and allows researchers to better understand the current state and evolution of our Universe. I will address in this talk several highlights in the studies based on the observations of MAXI so far.