Koichi Sasada is a programmer, mainly developing Ruby interpreter (CRuby/MRI). He received Ph.D (Information Science and Technology) from the University of Tokyo, 2007. He became a faculty of University of Tokyo (Assistant associate 2006-2008, Assistant professor 2008-2012). After 13 years in University, he joined Matz's team in Heroku, Inc (2012-2017). At 2017 he joined Cookpad Inc. He is also a
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