This book explores the cultural identity of second language (L2) teachers based on a range of diverse methodologies and perspectives, including biological, sociocultural, and ecological dimensions. By critically examining the intricate relationship between language and identity, consideration is given to the factors that contribute to the formation and development of this identity, and how that manifests in the group context and in teaching practice. The book tries to highlight a fractal tapestry perspective to depict the theoretical and practical aspects of L2 teachers? cultural identity. Alongside practical insights into the integration of cultural identity theory in the teaching environment, this book offers a comprehensive toolkit for conducting insightful and meaningful research in this area. It will be of interest to L2 educators and researchers who are active in the area of teacher development and professionalism, as well as postgraduate researchers in applied linguistics and cultural identity.