Mark Biltz, founder of El Shaddai Ministries in Washington State, is a well-known commentator on the feasts of the Lord. He has produced a series of DVD's on the feasts that have gone around the world. He is also the author of Blood Moons and Decoding the Antichrist and the End Times. His research and theories have earned him guest appearances on both radio and television as well as the covers of magazines.