Our afternoon Expert is in will be Mike Ryan (mikeryan) from Virtuoso Performance.
Mike Ryan, the sole proprietor behind Virtuoso Performance, is best known to contemporary Drupalists as the author of the Migrate module and its progeny (migrate_d2d and wordpress_migrate). This migration ecosystem provided the initial basis for the Drupal 8 migration framework, and Mike continues to develop tools for Drupal 8 migration (migrate_plus, migrate_tools).
Old-time Drupalists may recall Mike as the original author of pathauto, as well as a few small statistics-related modules.
Stick around after lunch and ask Mike all your migrate questions!