The Jeffrey is defined as the distance one is at any given time from a Jeffrey-Tambor-in-"And Justice For All"-style meltdown in which one shaves one's head and becomes a saffron-robed Hare Krishna, with one Jeffery being defined as the equilibrium position in the normal population, so that one is twice as far from that meltdown at two Jefferys.
It is great fun to place people into this system. Of course, each of us may be at a different place on this scale on any given day. But a list of the rating in Jeffreys of selected persons will appear (for a while at least) over there on the right side of this page. Feel free, by comment, to suggest others and their Jeffrey ratings or to take issue with the ratings given. Decisions of the judges are final, and manifestly right.
Oh, and by the way - the Jeffrey is copyright of this author, and may only be reproduced with reference to this page. Keep your mitts off, SI!