Far too little attention has been paid to the role that assistant principals have in the development of high performing schools. Impact provides specific, practical, and replicable leadership strategies for today's assistant principal. Impact describes how to build meaningful principal/assistant principal leadership teams. The opportunities that assistant principals have to be the instructional leader of the school and the voice of the faculty, and the principal; in other words, how to "lead from the middle" are examined. Impact is a practitioner's guide for the assistant principal striving to be a school leader. Target audiences include teachers wishing to become assistant principals, current assistant principals looking to excel and lead careers of significance, colleges of education working with graduate students who are being trained in P-12 school administration, and sitting school principals looking to expand the often under-utilized, potential of the assistant principal. This book examines the art and science of the assistant principal as a school leader; as a leader who impacts the lives of teachers and students. Great assistant principals matter.