Figured it out, guys.
First of all, when you google "James Portnow call of duty", you get this for the first result: https://docs.google.com/spreadsheets/d/1o1ZBtS8ZKImDzRUONiV3UAGbIqulgXBQ0W15Do8D61Q/edit#gid=0
ok, but let's dig deeper
by which I mean, look like five google results down the list:
http://archive.is/0qPFS (archive link in case someone sees this and edits Portnow out of the article)
>CALL OF DUTY: DEVIL'S BRIGADE REVEALED (Polygon, 2012)
>VandenBerghe hired designers he felt fit Underground Development's revitalized culture. Non-bootlickers, as he put it - people perhaps smarter than him. Kyle Brink came on as Lead Designer. James Schomer and D. Aarron Steelman served as designers. James Portnow handled sound and a variety of other duties.
So, maybe Portnow did work on a Call of Duty game after all… but, he's the only one listed in that paragraph without being credited as a designer, but as being in charge of "sound and a variety of other duties"
okay, so what's Call of Duty: Devil's Brigade? let's google that now
oh it was a cancelled video game; awesome (pic related)
So, there you go, folks: James Portnow has "worked on the Call of Duty series" by doing the sound and other various minor tasks for a Call of Duty title that was cancelled. He is not some expert paragon of game design that everyone pretends he is.
Turns out, Extra Credits really is just as useful as overhearing freshman game design students loudly espousing opinions about Dark Souls in the cafeteria, after all!
Someone should really get Comair or Ellinger to make a statement about this. Also, you guys should probably spread this; seemingly nobody else online is questioning Portnow's credentials, everyone just thinks he's some cool and smart designer guy who worked on Call of Duty 4.
Also, if you can't trust DigiPen about Portnow, what can you trust them about?