Mr. Hoshino lecturers at GLOBIS University on accounting, finance, and management philosophy. Prior to GLOBIS, he worked for a Japanese trading company, where he was engaged in financing natural resource development projects, mainly in Southeast Asia. He has also worked as a non-executive director at a petrochemicals manufacturing company specializing in equity investment, project lending, and marketing petrochemical products.

He earned his MBA from the Kellogg School of Management at Northwestern University and an LLB from Keio University. He also co-authored Financial Management (New Edition), among other books from Diamond Publications.