Arkady is, without a doubt, a very intelligent man. But that's not to say he hasn't pulled a few strings to get where he is today; a good example of this being the dubious jobs he had to take in order to even get into medical school. This isn't something he talks about or even mentions in recent times, and it's impossible to find any evidence of any slightly incriminating thing he's ever done.
Had a tendency to hop from planet to planet, likely wanted in quite a few places. Used to stow away on ships until he actually got his own. Overall chaotic motherfucker.