Lars and Anders at the Pammakaristos
Lars Brownworth is an author and former United States history and political science teacher at The Stony Brook School,and the creator of the top 50 podcast, 12 Byzantine Rulers: The History of the Byzantine Empire. This podcast was created on a whim by Lars and his brother, Anders Brownworth. Often mistaken for a college professor, Lars was, in fact, a high school history teacher at the time the podcast was produced. He's written a bunch of great books and Byzantine, Norman and Viking history. These videos are great - they'll give you an introduction to all of the subjects he has covered in them. He has also a series of video lectures on Byzantine history. You can see them all on YouTube.
Here's a picture of Lars in front of the Deesis mosaic in Hagia Sophia, the videos are below:
Lars and Anders at the Pammakaristos