This document is a dissertation submitted by Yune Kim Tran to the University of Texas at Austin in partial fulfillment of the requirements for a Doctor of Philosophy degree. The dissertation examines perceptions of teachers' preparedness and efficacy beliefs for teaching English Language Learners. It includes an acknowledgements section, table of contents, abstract, and five chapters discussing the literature review, research design and methodology, data analysis, findings, and implications for future research. The dissertation was approved by a committee of five professors.