I think he's a doctor in crushing dreams. In the long time I've been aware of him, any headline starting "Dr. Marko says... " is usually someone in their teens or early 20s having their vision of a future in motorsport smashed to bits with little/no chance of getting it back.
Was about to link the post in the F1 thread, then realised it was also yourself that posted that!
Coincidentally, most media outlets have stopped adding the 'Dr.' before his name when reporting this story!
(His Doctorate is in Law, he's not an MD)