What constitutes a “good teacher” and “good teaching” has come under much scrutiny in an age of globalization, transnationalism, and increased demands for accountability. It is against this evolving landscape and the pathbreaking work of the Douglas Fir Group (DFG, 2016) that this special issue engages the following two broad questions: (a) In what ways is language teaching “identity work”? and (b) To what extent does a transdisciplinary approach to language learning and teaching offer insight into language teacher identity? We begin this Introduction with a discussion on identity research in second language acquisition and applied linguistics, and then address innovations in language teacher identity research, exploring how this work has been advanced methodologically through narratives, discourse analysis, and an ethical consideration of research practices. We then consider how the transdisciplinary framework of the DFG, and its focus on macro, meso, and micro dimensions of language learning at the ideological, institutional, and classroom levels, respectively, might contribute to our understanding of language teacher identity. In the final section, we argue that the host of complementary theories adopted by the six contributors supports the view that a transdisciplinary approach to language teacher identity is both productive and desirable. Further, the contributors advance the language teacher identity research agenda by taking into consideration (a) how teacher identity intersects with the multilingual (Higgins and Ponte) and translingual (Zheng) realities of contemporary classrooms, (b) the investment of teachers in developing the semiotic repertoires of learners (Stranger–Johannessen and Norton) and a socially inclusive learning environment (Barkhuizen), and (c) the emotions (Wolff and De Costa) and ethical practices (Miller, Morgan, and Medina) of teachers. Central to all articles in this special issue is the need to recognize the rich linguistic and personal histories that language teachers bring into the classroom in order to promote effective language learning.

This article aims to broaden the scope of language teacher identity research by investigating the emotional demands on teachers‐in‐training and nonnative English‐speaking teachers (NNESTs) in particular. We examined how our focal NNEST participant, Puja, was confronted with and successfully negotiated numerous emotional challenges in her first year in a U.S. MATESOL program. Furthermore, we investigated the impact emotions had on her overall teacher identity development and how her growth as an educator was evident in her use of strategies. Following past research that viewed teacher emotions through a narrative lens (e.g., Barkhuizen, Benson, & Chik, ; De Costa, ), we created Puja's ‘story’ by analyzing data sources that included interviews, teaching observations, journal entries, and stimulated verbal and written reports. Our narrative construction focuses on the reflexive relationship between Puja's emotions and her subsequent identity development. While we acknowledge that emotional tensions are part of teachers’ identity development (and potentially more so for NNESTs), Puja largely navigated emotional challenges in a positive manner. The article concludes with a call for new pedagogical models that help teachers develop their reflexivity and negotiate potential emotion‐related challenges they might encounter.

The growing interest in identity and language education over the past two decades, coupled with increased interest in digital technology and transnationalism, has resulted in a rich body of work that has informed language learning, teaching, and research. To keep abreast of these developments in identity research, the authors propose a series of research tasks arising from this changing landscape. To frame the discussion, they first examine how theories of identity have developed, and present a theoretical toolkit that might help scholars negotiate the fast evolving research area. In the second section, they present three broad and interrelated research questions relevant to identity in language learning and teaching, and describe nine research tasks that arise from the questions outlined. In the final section, they provide readers with a methodology toolkit to help carry out the research tasks discussed in the second section. By framing the nine proposed research tasks in relation to current theoretical and methodological developments, they provide a contemporary guide to research on identity in language learning and teaching. In doing so, the authors hope to contribute to a trajectory of vibrant and productive research in language education and applied linguistics.

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AFM images show that chromatin reconstituted on methylated DNA (meDNA) is compacted when imaged under water. Chromatin reconstituted on unmethylated DNA is less compacted and less sensitive to hydration. These differences must reflect changes in the physical properties of DNA on methylation, but prior studies have not revealed large differences between methylated and unmethylated DNA. Quasi-elastic light scattering (QELS) studies of solutions of methylated and unmethylated DNA support this view. In contrast, AFM images of molecules at a water/solid interface yield a persistence length that nearly doubles (to 92.5±4 nm) when 9% of the total DNA is methylated. This increase in persistence length is accompanied by a decrease in contour length, suggesting that a significant fraction of the meDNA changes into the stiffer A form as the more hydrophobic meDNA is dehydrated at the interface. This suggests a simple mechanism for gene silencing as the stiffer meDNA is more difficult to remove from nucleosomes.