She is a faculty member for the UCLA genetic counseling master's program, having formerly been an assistant professor at Vanderbilt University and the Seattle Children's Research Institute, affiliated with the University of Washington School of Medicine.[5] Garrison joined the Division of Bioethics in the Department of Pediatrics at the University of Washington School of Medicine in 2015. The following year, she was awarded a 5-year National Institutes of Health K01 career development grant. Her project, 'Genomics and Native Communities: Perspectives, Ethics, and Engagement', aims to investigate the viewpoints of tribal leaders, physicians, scientists, and policymakers on genetic research involving Indigenous communities.[6]
In 2019, Garrison received a grant to collaborate with pharmaceutics researcher Katrina Claw to conduct a survey of Navajo leaders, educators, and community members about their concerns regarding genetics research in tribal communities.[7] She has also played a role in the negotiations between the Navajo Nation and the NIH that have resulted in a data-sharing agreement. This agreement will allow researchers to access health information of consenting Navajo participants;[8] however, this does not permit access to genetic data or biological samples, which has been banned since 2002.[9]
Garrison co-facilitates the Summer Internship for Indigenous Peoples (SING),[10] which consists of an international set of workshops that focus on facilitating discussions on Indigenous people's cultural values and building capacity to increase the number of Indigenous peoples in science research, leadership and teaching careers.[11] Garrison has served as a Member on the Advisory Council of the United States Indigenous Data Sovereignty Network.[12]
In 2009, Garrison received the 12th Annual Anne Ninham Medicine Mentorship Award from the American Indian Staff Forum at Stanford University.[5] In 2012, she attended the Society for the Advancement of Chicanos and Native Americans in Science (SACNAS) Leadership Institute, sponsored by SACNAS and the American Association for the Advancement of Science.