Coaching, supporting and helping teachers grow are all part of the principal's job. Here's what works and what doesn't.Follow: @larryferlazzo @22southpaw @Bamradionetwork#edchat #teachers #edtech Mark Estrada is the principal of Lockhart Junior High School in Lockhart, Texas. Mr. Estrada has experience as a middle school social studies teacher, middle school instructional administrator, and elementary principal. He is an ASCD 2014 Emerging Leader and Doctoral Fellow at The University of Texas—Austin Cooperative Superintendency Program (CSP). Diana Laufenberg is a Nationally Board certified Social Studies teacher currently teaching 7th graders in Flagstaff, AZ.