ISS has published a collection of essays entitled 25 for 25: Observations on the Past, Present, and Future of Corporate Governance In Celebration of ISS’ 25th Anniversary. The publication is here:
http://issgovernance.com/files/ISS_25for25.pdf
The Board Director Training Institute (BDTI) is a "public interest" nonprofit in Japan dedicated to training about directorship, corporate governance, and related management techniques. It is certified by the Japanese government to conduct these activities as a regulated nonprofit. Read a summary about BDTI here, and see a menu of its services for both corporations and investors here.