I'm surprised this hasn't been discussed yet. I know it can be difficult to type mass murderers because of how mentally deranged they usually are, but I'm still curious about his socionics type. It's apparent he's introverted and logical, but beyond that I'm not sure. He had a sharp ability to analyze mathematics and use that skill to make tons of money gambling. So I'm thinking Te creative perhaps. I'm leaning towards ILI at this moment. Anyone else have any thoughts?