JSTOR This link opens in a new window
This is a great resource for academic journal articles with analysis about the thoughts, ideals, life, etc. of the philosophers. Be specific in your search terms- do not do a broad search with just the philosopher's name. Instead, use the name and possibly the name of his or her famous works, or whatever topic you are looking at (such as religion, politics, etc.). Perform multiple searches, and use the Advanced Search function.