The Rice University Office of STEM Engagement’s (R-STEM) Regional Computer Science (CS) Collaborative expands the pipeline of teachers qualified to provide high-impact instruction in computer science courses in the Houston metropolitan area by supporting development of content knowledge and stimulating the desire to teach such courses. R-STEM provides teachers with comprehensive professional development (over 80 hours) based on research-supported practices. Where the Rice Regional CS Collaborative separates itself from other professional development training programs is the wide spectrum of diverse STEM teachers served from various school districts and our intentional focus on presenting computer science content in a way that supports inquiry-based, constructivist teaching strategies. The Rice CS Collaborative model will provide teachers with evening and Saturday workshops during the spring semester (4) introducing them to coding fundamentals and CS teaching pedagogy as well as a three-day summer institute featuring Rice CS faculty and Houston area CS leaders with a major emphasis on coding applications and classroom teaching. The major objectives are to: 1. Improve teachers’ content knowledge in computer science topics and related TEKS through inquiry-based learning experiences. 2. Prepare teachers to successfully pass the TExES Computer Science 8-12 exam by focusing content hours on discussions and activities centered on each of the tested competencies. 3. Impact student exposure to computer science topics in a variety of courses at different grade levels by targeting teachers across the STEM spectrum. These major objectives can be accomplished through R-STEM’s intensive professional development program. All program outcomes will be assessed based on a comprehensive evaluation and research plan.