He also works for a company in the nuclear industry and frankly that byline is not all that impressive to me. "Professional speaker" is not a qualification, and

He also works for a company in the nuclear industry and frankly that byline is not all that impressive to me. "Professional speaker" is not a qualification, and "expert" is suitably wishy-washy at this point that it's nearly meaningless, especially when one uses it to describe oneself.