Teaching is very difficult, but at the same time a very sacred career. Unfortunately, some teachers may change their careers at the beginning or at any stage of their careers. This may be regarded as the waste of human capital when individual and societal costs of the training are considered. But pursuing an unsatisfying career usually means depressive episodes in professional life. For teachers, there are alternative satisfying career paths compatible with their training such as class leadership, master teacher, mentor teacher, teaching specialist, education consultant, teacher coaching, deputy director, student dean, and school director. In addition to these career paths, as studied in this study, teacher leadership has emerged as an alternative career path in recent years. In this conceptual study, definition, reason, and historical development of teacher leadership, model of teacher leadership, roles and responsibilities of teacher leaders, and finally, their preparation are discussed.