It is a small world sometimes, it turns out I know Paul Prucnal and in fact did some work with him to try and commercialize some of his high speed optical switching technology. He is a brilliant and very nice human being. What I find somewhat odd about his selection as an expert for PRKR is that his primary field of expertise is optics not RF (read his resume on the Princeton website it is all about his optical credentials with RF never mentioned). I am not saying that a top optical engineer doesn;t know anything about RF but it would seem more logical to have selected an expert with a resume in RF similar to Prucnal's in optics.
I'm pretty sure PRKR couldn't find an RF expert willing to say what they wanted (or even take the case?), so they got someone in Optical networking. Anyone who knows about RF would know about the massive amounts of prior art for the ParkerVision patents & would feel offended that the patents even issued.