From what I am reading in the articles linked above, he does not seem to have identified himself as "professional engineer." Rather, Oregon's state law is unus

From what I am reading in the articles linked above, he does not seem to have identified himself as "professional engineer." Rather, Oregon's state law is unusual in restricting the use of the term 'engineer' itself to licensed "professional engineers" (as they are referred to elsewhere). Perhaps a person who is trained as an electrical engineer and who has a history of employment as a researcher and developer of audio electronics (in Oregon) should not think of or refer to themselves as an 'engineer' unless they are licensed in the jurisdiction they happen to be in, but this is a problem with a simple fix, and it is a problem unique to Oregon.