For more than 12 years, the National Science Foundation’s (NSF) Graduate Fellows in K-12 Education (GK-12) Program embedded graduate students in school classrooms to serve as content contributors and role models. Marine or environmental science was represented among the science, technology, engineering, and math (STEM) projects nationwide. The Virginia Institute of Marine Science (VIMS) conducted a GK-12 project with a distinctly marine science focus from 2009–2015. Through partnerships with local secondary schools, VIMS matched graduate students (Fellows) with mentoring Partner Teachers. The project sought to build the graduate students’ communication and teaching skills, while enriching teachers’ familiarity with current ocean science research and practices. The GK-12 model proved to be very successful at VIMS, as it was elsewhere. Positive outcomes included greater graduate student skill and confidence in communication, enriched teacher understanding of marine science content and research practices, and improved student performance and perceptions of science. The partnership also generated a collection of marine science lesson plans. While effective, the GK-12 immersive design was costly and many institutions are now seeking alternative means to facilitate graduate student contributions to STEM classrooms. VIMS is testing two models. One model is a continuation of GK-12 on a smaller scale. The other model challenges graduate students to develop a lesson plan based on their research, but has project teachers conduct classroom testing. The following chapter provides an overview of these programs and offers an example of project structure, timing, outcomes, and lessons learned that can serve in planning similar endeavors.