This week: John Spencer
John Spencer is a staff scientist at Southwest Research Institute's Department of Space Studies in Boulder, Colorado and is a member of the New Horizons  and Cassini  science teams. His research interests include the moons of the outer planets, particularly the Galilean satellites of Jupiter and the icy moons of Saturn. When he's not staring at a computer screen, he loves exploring Colorado's mountains with his wife Jane and their dog Maggie.
John Spencer has the definitive post on the whole "What is a planet?" deal, over at the planetary society blog. Now let us all play the sit-down-and-be-quiet game, please?
Alan Stern, head of the New Horizons mission (and therefore presumably John Spencer's boss) has other ideas. The lastest news item currently on the New Horizons website is an attack on the IAU's decision and a call to arms. Stern's opinion, expressed more eloquently in this article published shortly after the discovery of 2003 UB313, is that while Pluto's planethood was once opposed because it was considered a misfit, it is now opposed because we are beginning to realise that Pluto is in fact an exemplar of the bodies that make up the vast majority of the solar system.
I think the only sensible way to settle this 'debate' is... PRO-WRESTLING. 2003 UB313 Vs Jupiter, no holds barred! Hit it with the chair, Jupiter! Hit it hard!