LOL. Sorry....not "bragging". I "do" think that if someone has specific special background in a subject, that it is germane to say so.
Case in point....."thackney" and I disagree over some forms of "green energy", but then "thack" posts something about the petrochem. industry, I pay closer attention, because I know that he indeed has special and specific background in the area.
And in the area of chemical measurement, I "am" an expert, with background in the area on a par with "thackney"'s in petroleum.
Look up "R&D 100 award". I've won two in my lifetime, both for innovations in chemical measurement technology.
No brag, just fact.