A penthouse apartment in NYC, on an academic salary. I'm sure he gets wined and dined at meetings and presentations. He's developed a very nice life for himself, and it's not like he's living in a geodesic dome, showering with recycled rainwater that he heats with the sun, eating the hydroponic vegetables he grew.
On a *government* salary.
That he has a penthouse apartment in NYC is prima facie evidence of having accepted bribes.