These databases include biographical information and often contain production history information as well.
If you are not finding information about a person by searching for his or her name, think a little more broadly about where he or she fits into the bigger picture: Is this person an actor, a director, a playwright, a designer? What time period? What genre?
For theatre and performance reviews, interviews with writers, directors and actors, and more. For a complete list of Newspaper databases click here: http://library.hunter.cuny.edu/databases/type/11
Newspaper databases are also good sources of production history information by way of reviews.