When you don't have a license to perform a professional service, the value of your services is considered to be worth absolutely nothing. No point throwing mud at someone else when you are already covered in it. When you get your license, you can move on. This isn't the fight for you to pick. Hope this perspective helps!
This is actually pretty simple. You seem to have a WPCL "wage claim" where you can not only collect the actual damages but be awarded mandatory attorney fees. Blackmail is a double edge sword as the employer knowingly employed an unlicensed cosmologist. The parties in employment cases who typically get in the most trouble are the employers. I doubt he wants make a stir.
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Get a lawyer and file a wage claim, as my one colleague indicates. For employment attorneys, this is pretty straightforward. I don't practice in this area, but feel free to contact my office and I can provide you with a recommendation in Pittsburgh.
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Also, rat your owner out to the IRS for failing to withhold taxes from employee wages.
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