Not sure about the legal reporting requirements, but since my wife works at one of them I can tell you first-hand that they don't get much on top of their base

Not sure about the legal reporting requirements, but since my wife works at one of them I can tell you first-hand that they don't get much on top of their base salary. Non-profits are 80%+ salary compensation, even at the highest levels. Also, engineering societies generally are based in major cities.