Probably works for or is associated with a company or organization that is connected to or may be involved with Amarantus in the future and wishes to avoid any number of potential scenarios that may create a conflict of interest.
Always assume that an e-mail may well be a public document at some point in the future. Never put anything in an e-mail that you don't want everyone to know.
Go back and read his past posts. Whoever he is, He is definetly in the know about AMBS and the industy. I've been following him for a few months now. Long AMBS