A company's past SEC filings would contain the names of its directors. These filings can be retrieved from EDGAR or Nexis Uni.

To search for filings in EDGAR, click the search for company filings link.

To search for filings in Nexis Uni:

• Click Advanced Search under the search box. 
• Select Company and Financial 
• Click on SEC Filings

• Enter a company name and click Search

A company's past directors can also be found by searching Corporate Affiliations for historical company information. Click on Subscriber Tools and then Historical Search.