K-12 teacher professional development in STEAM (Science, Technology, Engineering, Arts, and Mathematics) is often utilized to enhance teachers’ abilities to use STEAM pedagogical methods in the classroom. One such program is GoSTEAM, a five-year initiative centered on K-12 teacher professional development in STEAM. Teachers participating in GoSTEAM collaborate on the implementation of STEAM lessons and activities with an Innovator-in-Residence, who is an individual with experience in a STEAM field, often from a local community organization or university. This study analyzes focus group findings from teachers and school administrators to assess how the partnership with the Innovator-in-Residence impacts teachers’ professional development in STEAM. The findings suggest teachers and administrators perceived there to be several impacts on teachers’ professional development as a result of the partnership, such as the development of STEAM skills and making connections between STEAM, district standards, and real-world concepts. As such, the results of this study indicate that a teacher’s professional development in STEAM can be impacted by an ongoing partnership and collaboration with community partners and those experienced in STEAM fields.