I'm fairly sure the "Masaru Tateyama" here is the same person as the "Hiroshi Tateyama" on this Armored Core album:
http://vgmdb.net/album/3094. I didn't have much luck finding any information about him or the company he worked for, Dragon & Company, so I'm not sure which name is correct, if they're indeed the same person. Armored Core: Project Phantasma goes with Hiroshi:
http://www.youtube.com/watch?v=qdaFuXiem5E#t=0m34s.