At the university level, peer instruction has been widely implemented as a means to offer additional resources through mentorship and academic support for courses with high enrollments and/or high levels of attrition. Peer instructors are students themselves who have typically demonstrated a proficiency in the course for which they serve. In the present work, the peer instructors are a part of the Teaching Internship, a credit-bearing program that includes both a training component and a

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... g component. Specifically, Teaching Interns, or TIs, receive training in pedagogy and best practices while providing assistance to students in General Chemistry, an introductory-level science course with notoriously high rates of attrition. While the majority of prior research in this area has examined the benefits to the students on the receiving end of peer learning, the work presented in this dissertation places the spotlight back on the peer instructors themselves. Various frameworks, methodologies, and types of data collection are explored and utilized in order to examine the research questions from multiple angles. Chapter 2 provides the context in which these studies took place and outlines the development of the Teaching Internship and the closely-related Certificate in Chemistry Education program. Chapters 3 and 4 present findings from two separate studies on the TIs following a mixed-methods and qualitative approach, respectively. The results from these chapters demonstrated positive changes in TIs' chemistry content knowledge, learning beliefs, and verbal behaviors, stemming from their participation in the TI program. To add further context, a quantitative approach used in Chapter 5 provided validation for the use of an instrument to quickly and accurately measure deep and surface learning approaches in General Chemistry students. While the findings of this study can be used to inform the instructional practices within the General Chemistry courses themselves, these results may also provide insight as to how the [...]