Boy GitHub doesn't handle you abandoning an email address particularly well when dealing with their Contributors page.
If you compare the Contributors page for Eclipse OMR with the output of git shortlog, you notice a divergence
$ git shortlog -sn --no-merges | head -n 4 176 Matthew Gaudet 168 Leonardo Banderali 137 Robert Young 128 Nicholas Coughlin
Turns out, the issue here is that I gave up my IBM email on GitHub when I left. So now, GitHub can't link my commits in OMR to me, so I no longer show up as a contributor.
I'm not actually upset about this, but I do wonder about the people who (wrongly) say "GitHub is your resume", and the ways this disadvantages people.