Many articles about school improvement talk about data-driven instruction and statistics. In the barrage of evaluative numbers, school leaders can forget that teaching and leading are arts, not sciences. Positive outcomes depend on the ambience of the school, which is a direct result of the leadership style of its principal and assistant principals. But most school leaders lead intuitively and few analyze their strategies and styles to identify the principles they lead by. This article presents 14 principles of school leadership that will help school leaders set a positive tone for their schools. By setting a positive tone, school leaders lay the necessary groundwork for improved teaching and learning.