He has this to say, in a conversation on Slate:
I see absolutely no value to a judge of spending decades, years, months, weeks, day, hours, minutes, or seconds studying the Constitution, the history of its enactment, its amendments, and its implementation (across the centuries—well, just a little more than two centuries, and of course less for many of the amendments). Eighteenth-century guys, however smart, could not foresee the culture, technology, etc., of the 21st century. Which means that the original Constitution, the Bill of Rights, and the post–Civil War amendments (including the 14th), do not speak to today.
Guns.
Also from the article: "I think law schools should be hiring a higher percentage of lawyers with significant practical experience."
I suppose this is true generally but probably depends on the specific subject matter.
I blogged about practical experience here awhile back … http://www.thefacultylounge.org/2014/07/a-new-facet-of-faculty-diversity.html
What was in that oath that Judge Posner swore when he went on the public payroll decades ago?