This volume brings together original papers from language education scholars from around the world to explore, exemplify, and discuss the multiplicity of boundary crossing in language education. It emphasizes the potential of boundary crossing for expansive learning, and aims to generate new insights, through boundary crossing, into the complexity of language education and approaches to innovative practices. This volume also underscores the important role of expert boundary crossers. In particular, it aims to honor G. Richard Tucker, Paul Mellon University Professor Emeritus of Applied...