Mark Lehner signed card; obtained through the mail.  Mr. Lehner is a "real" hero!  An expert on the Giza Plateau pyramids, he also heads the Giza Mapping project (another noble endeavor), which helped uncover a village dating from the time of the Giza Pyramids construction period, helping us learn about the people who worked on the building.  You can see Mr. Lehner in several documentaries which air occasionally on the Discover channel and History channel.  He's great!