John Mark Ockerbloom is a digital library architect and planner at the University of Pennsylvania. Besides his blog Everybody's Libraries, he also has a Selected Works site that has a number of his papers and presentations. You can send him email by writing to “ockerblo” at “pobox.upenn.edu”. In case you ever feel a need to catalog any of his work, his authorized name heading is “Mark Ockerbloom, John, 1966-“. John’s Twitter posts are at @JMarkOckerbloom.