There is a pandemic of low-value clinical care that threatens the sustainability of our publicly funded healthcare systems. Over 30% of the health services provided to patients provide no benefit or may actually result in harm. Health services research is needed to critically evaluate our clinical practices and programs to ensure we create systems that consistently deliver high-value care. Unlike drug trials, health services research is complicated by enormous heterogeneity across cultures, environments, behaviours and systems. Ideally, local research communities should devise and conduct health services research to ensure that both the research questions and outcomes are relevant to community members, and thus more likely to result in sustainable healthcare systems. Embedded researcher models are emerging as a viable approach to supporting local research activities. Embedded researchers are part of the community they serve, provide research expertise to local investigators and community members, and help develop local research systems that facilitate health services research activities. While they may still collaborate with academic partners, this is not necessary for their research success. This thesis documents the transformation of a large community hospital in Ontario into a learning health centre through the use of an embedded researcher model. The first part of the thesis is focused on the results of incorporating an embedded research plan into the hospital’s new antimicrobial stewardship program. The research that emerges from this work contributes new knowledge about the value of antimicrobial stewardship to important patient outcomes such as reduced lengths of hospital stay and rates of Clostridium difficile infections. The thesis concludes with a discussion of the implementation of all the necessary components needed to support a learning health centre and how an embedded researcher model facilitated this transformation and could be used by any similar organization to achieve the same result. / Thesis / Doctor of Philosophy (PhD) / Over 30% of the health services provided by our healthcare systems does not benefit and may actually harm patients. Health services research is therefore a necessary activity required to reduce this waste. In Ontario, over 65% of patients receive their acute care in large community-based hospitals, and yet, these hospitals have minimal research activity and capacity despite repeated attempts by the academic research community to engage these institutions through a variety of collaborative models such as integrated knowledge translation. This thesis provides a blueprint for the transformation of a large community hospital into a learning health centre through the use of a locally created, locally relevant, embedded researcher model. Starting with a proof of concept through the systematic evaluation of an antimicrobial stewardship program, the thesis ends with a ‘how to’ guide for the implementation of the foundational elements needed to support health services research in similar organizations.