Dr. George Collison is a nationally known science and mathematics educator. He is one of the founders of the Virtual High School(tm) and lead author of the Seeing Math(tm) video case studies distributed by PBS Teacherline. He has authored courses in algebra, calculus, and physics. George was invited by USAID on several occasions to help science and mathematics planning and write curricula in Africa. His passion lies in crafting clear, highly engaging presentations that build careful bridges from concrete experiences to abstract concepts.