Most research companies require their PhDs to clearly document the design, development, test setup, results clearly. My boss knows which finger I use to pick my nose. By following my record, any PhD graduated from decent college from the same field can repeat my work. Of course the right candidate can do the work fast and better.
GERN has very good researchers. If you read there quarter report, you will find that they only sales come from SBIR which is very competitive and respectable. Their lead researchers can be professors at any college. Their work is monitored closely by NIH which is under the gun to see GERN to be successful.