"Teachers Teaching Teachers" ("T3") focuses on coaches' role in the professional development of teachers, exploring challenges and rewards that teacher leaders encounter. This issue includes: (1) Call to Action: Landmark Study on Professional Learning Calls to Teacher Leaders (Joellen Killion); (2) Tools: Hone Your Understanding of Effective Professional Learning; (3) Voice of a Teacher Leader: Mountaintop Cheers Fall Flat (Bill Ferriter); (4) Focus on NSDC's Standards: Many Hands Improve Leadership (Joellen Killion); (5) Lessons from a Coach: The Relationship Starts with Respect; and (6) Research Brief: Adults Collaborate, Students Gain (Carla McClure). (Individual articles contain references.) [For Volume 4, Number 4 of "Teachers Teaching Teachers," see ED504759.]