Teaching Director Martha Zeher I graduated from Millersville University with a degree in Special Education and have enjoyed teaching and/or tutoring for the past 20 years. As one of the founders of Cornerstone Academy of Glennwood (Mount Airy), I am passionate about using multi-sensory teaching with children who have learning differences. It has been a great joy and blessing to see many students become confident and successful learners in the nurturing, structured environment we provide.