Dr. Karl E. H. Seigfried is a writer on mythology and religion. A Norse mythologist and musician in Chicago, he is Theology and Religious History Faculty at Cherry Hill Seminary and Adjunct Professor, Pagan Chaplain, and Pagan Forum Faculty Advisor at Illinois Institute of Technology. He serves as goði (priest) of Thor's Oak Kindred, an inclusive organization dedicated to the practice of the Ásatrú religion in Chicago.

Karl's website, The Norse Mythology Blog, was named the world's Best Religion Weblog in 2012, 2013, and 2014. It is the first religion blog to enter the Weblog Awards Hall of Fame. In addition to original articles and interviews on myth and religion, the site features projects such as the Worldwide Heathen Census 2013, a first attempt to estimate current numbers of adherents of the modern iterations of Norse religion.

Karl is a featured columnist for The Wild Hunt, the primary international source for news and commentary relating to minority religions.