Seems extremely unlikely that he resigned voluntarily. If that were the case, he would have transitioned to the incoming CEO himself over a few weeks or at least a couple. He was removed with immediate effect and was wiped out instantly from the ADXS website.
He probably was given an option to resign, along with a few kind words delivered publicly to save face, since he did have some notable accomplishments, or be fired with no dignified sendoff. He chose the former.
I agree with Ignatius. I see a big deal or buyout coming. After a sustained SP run up over the next few months if it is the latter.
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