It's possible that:
* "Backroom casting" is a term used in a specific context you haven't provided. If you can clarify what you mean by "backroom casting," I might be able to help.
* "Leslie" is a character or name from a fictional story or project.
* "Leslie" is a person involved in a private or non-public project. Without more information, it's impossible to identify this person.
Please provide more details about what you are looking for, and I'll do my best to assist you.