Joshua Angrist has written a tribute to Alan Krueger

Alan Krueger died a year ago this week. I think of him often, and would like to mark the anniversary of his death by sharing a story of my time with Alan. Alan and I had a lot in common. First, we were both born in the third quarter; that is, we’re QOB3s. In fact, Alan was only one day older than me. We used to joke that this explains his relative success: it’s an age effect!

There is much more at the link, moving throughout.  And here is the Joshua Angrist introduction to econometrics course on Marginal Revolution University.