Hiroshi Koyama is currently Executive Fellow of Electronic Systems Group of Mitsubishi Electric Corporation (MELCO).

In April of 1987, he had joined in MELCO and started his career as Chief Engineer for rendezvous and docking system of Engineering Satellite-VII (ETS-VII) & H-II Transfer Vehicle (HTV) in Kamakura Works. Since then, he has experienced satellite system development and project management of various satellites including Communication Satellites, Earth Observation Satellites and Navigation Satellites.

In April of 2008, he was appointed General Manager of Office for Space Utilization and Strategy Planning at MELCO Head Quarters. He was responsible for promoting utilization of space in various fields such as navigation fields using Quasi Zenith Satellite. In April of 2015, he was appointed Executive Fellow of Electronic Systems Group and responsible for business development for MELCO space activities and promoting utilization of space.