Milton Friedman:

There a nice profile of Milton Friedman in last week's LA Times. There are many things to admire about Dr. Friedman -- high on the list for me, though, is the energy and passion he has brought to the campaign for school choice at a time when he could be sitting around enjoying his retirement; though it has receded some from the forefront of attention of newspapers and pundits, it remains, imho, probably the most important domestic issue facing the country for the long-term.