What happened to Neil Chriss?

This guy just got booted from Paloma - it's been a pretty quick fall from grace. Anyone involved with quant knows his name and the Almgren-Chriss market impact model.. Head of quant at SAC, started Hutchin Hill and grew it to $5 billion of capital (back when that was a large fund), went to Millennium to start a quant team (from all accounts hired a bunch of extremely expensive/ useless talent and failed), resurfaced at Paloma and seemingly got pushed out

What's the story? Is this guy a classic example of an academic who is good at marketing himself but doesn't actually know anything? Because thats what it looks like from the outside