RiskMetrics (formerly IRRC) is corporate governance data from ISS Governance Services. It includes historical governance data beginning in 1990, and historical directors data beginning in 1996. Further information can be found on the WRDS website (see links below).
The RiskMetrics databases are accessible through query pages on the WRDS website, and as SAS datasets on the WRDS unix server (wrds.wharton.upenn.edu).
WRDS Introduction (includes how to get an account)
WRDS Website (to request an account or to login)
WRDS Without Account (via Stern wireless, and on public terminals at Stern and Bobst Library)