Dr. Mitsuhiro Udagawa is President of Japan Solar Energy Society receiving a number of research awards due to his development of the EESLISM energy and environment assessment tool that dated back to the late 1980s. Today, the software has widely been used for building performance simulation assisting researchers and professionals in making decisions on the delivery of low to zero energy mass custom homes. He is the author of four books related to solar energy and building services. Representing Japan, he contributes regularly to intergovernmental organisations, e.g. IEA and ISO.