Nobel-Prize-winning economist James Buchanan passed away a couple of days ago at the age of 93. (Not to be confused with 15th president of the United States James Buchanan, for whom an obituary would be long overdue.) Buchanan's work was focused on public choice, and Dylan Matthews at the Washington Post described Buchanan as "the man who got economists to care about politics." (A pretty apt description, in my opinion, though my views on caring about politics are still a little hazy.)
To learn more about what Buchanan was all about, his Nobel Prize lecture is probably a good place to start.