Scientist-teacher partnerships are highly beneficial to K-12 STEM education. While much is known about the benefits for teachers in these partnerships, the corresponding benefits for scientists are less well known. With emphasis on the scientists’ perspective, here we describe our NSF RET (Research Experiences for Teachers) project consisting of five successive cohorts from 2012 to 2016. Coincident with a “once-in-a-century” expansion of the Panama Canal, the science research focused on the paleontology, evolutionary biology, and geology of this region to better understand the ancient Neotropical biota related to the Great American Biotic Interchange (GABI). In the field, scientists and teachers worked together collecting fossils and geological samples. Back in the K-12 classrooms, lesson plans related to their experiences were implemented and the teachers hosted scientist role-model visits. More than 30 scientists and 44 teachers participated in this Panama “GABI RET” project. Using a new validated survey developed during this project and focus groups, we explored the impact of this project, and in particular the perceived benefits accrued by the scientists. Our study confirmed that scientists felt they improved their communication skills, had a better appreciation for the K-12 teaching professions, greatly enjoyed working with the teachers, considered them colleagues, and many wanted to continue K-12 outreach as part of their careers. Overall, scientists perceived that they greatly benefited from these partnerships. In addition to describing their activities, they had numerous recommendations for similar partnerships in the future. For example, these include: (1) having more teachers participate in multiple cohorts, (2) continued opportunities for teachers to be involved in professional meetings, (3) ongoing webinars and face-to-face engagement, and (4) more diversity of racial and ethnic backgrounds, subjects taught, and regions represented. Although this case study was focused on the GABI RET, our results also potentially inform other projects that involve scientists’ education and outreach activities.