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Joe Jonas

Shadowed By Well-Known Addiction Specialist

10/11/2013 12:30 PM PDT BY TMZ STAFF



Joe Jonas has a new guy in his entourage -- a well-known addiction specialist who once worked with Demi Lovato, TMZ has learned.

We noticed the guy hanging with Joe as they walked out of a recording studio together in West Hollywood Thursday afternoon.

His name is Mike Bayer -- the CEO and founder of Cast Recovery Services.

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According to his profile on the company website, Bayer is described as being "well known for quickly responding to crisis situations" ... typically of the substance abuse/mental health variety.

It's unclear why he's with Joe -- but when photogs tried to talk to the rock star on his way into the  building, he made it clear he was not down for a conversation.

As TMZ previously reported, sources connected with the band are saying a possible breakup was tied to a conflict over musical direction, but who knows ...

We reached out to Joe's rep -- who had no comment.

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