It is difficult to provide a definitive list of actors and actresses who appeared in a specific 2011 production of "On the Verge" without knowing the location and company involved.
To find out who starred in a particular 2011 production, you can try:
* Searching online databases: Look for the production on websites like Playbill, BroadwayWorld, or the Internet Broadway Database.
* Checking theatre company websites: If you know the specific company that staged the production, check their website or archives.
* Contacting the theatre company or a local theatre historian: They may have information about the production and its cast.
Please provide more context about the 2011 production you are interested in (location, theatre company, etc.) so I can help you find the cast information.