This action research study explored effects of perceived lapses in professionalism and negative behavior medical faculty exhibited with medical students and the learning environment. This study revealed such behavior contradicts principles taught in formal undergraduate medical education and highlights hidden curriculum influences on students. It was evident professionalism can be taught and understanding faculty professionalism mindset, beliefs, and conduct is critical to medical education. This study emphasizes the need for medical schools to assess faculty professionalism and strategize interventions to address perceived negative behaviors. This study aimed to explore medical students' experiences and perceptions of clinical faculty members' professionalism at Eastern Medical School (EMS) to determine how to best educate clinical faculty about this study's findings. This study used action research methodology with quantitative and qualitative data sources to determine whether clinical faculty and medical students' professionalism views aligned. The researcher collaborated with clinical faculty colleagues; data were collected from electronic surveys on professionalism, clinical faculty interviews, and a professionalism workgroup made of EMS clinical faculty. In addition, secondary survey results of the annual Medical School Graduation Questionnaire by the Association of American Medical Colleges were reviewed and analyzed. Three central themes emerged: faculty rationalization of lapses in professional behavior, misalignment of faculty and student expectations, and need for sensitivity and teamwork development. These themes underscore the importance of enhancing clarity, communication, and education regarding professionalism to cultivate a culture of respect and professionalism in medical education. This study concluded by presenting key findings, recommendations, and a phased plan for implementing intervention initiatives. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]