It also occurs to me that several people who work on the Sahana Eden emergency management software might know who was active in CrisisMappers at the time. At least one of the current Sahana folks was in Haiti working for Oxfam and Nethope after the 2010 earthquake, and the Sahana CEO at the time was involved with CrisisMappers. I have to drop offline now, but can look for contact information tomorrow if that would be useful. One reason this might be relevant is that the CrisisMappers action in 2010 wasn't so much mapping as it was georeferencing tweets and SMS messages from people in Port-au-Prince.
But the HOT mailing list is, IMO, probably the first place to try, just because there are a lot of folks on the list who were around and mapping in 2010, and may have participated in the mapping response.
And you might end up wanting both information about how the Port-au-Prince region was mapped (in about a week), and about how the SMS messages / tweets were used to locate and get assistance to people.