In 1985, he attended the Royal College of Defense Studies in London.

Royal United Services Institute in Defense Studies, 1998.

Hagisaki worked at the National Institute for Defense Studies.

Institute of Defense Studies & Analysis, New Delhi.

He finished his Master of Defense Studies from the University of Canberra, Australia in 2000.

From 2002 to 2003, he attended the Royal College of Defense Studies in London.

He's also teaching at the French Institute of Defense Studies.

Japan Society for Defense Studies, Tokio 2008.

Royal College of Defense Studies in Britain('89 and '90)

He also obtained a Master of Science in Defense Studies in 1988 from the University of Madras, India.