Ready to inspire at a premier private institution in Brooklyn, NY ? Cross Country Education is seeking a high-caliber Long-Term STEM Substitute to join an elite, college-prep community in Red Hook. If you are a subject-matter expert in Mathematics or Chemistry who thrives in an accelerated, high-achieving academic environment, this is your opportunity to shine. Join a team dedicated to rigorous scholarship and help our students excel through February 2026! Position Overview: Facilitate high-level instruction for accelerated High School courses, including Algebra I/II, Calculus, and/or Chemistry, ensuring students remain on track with rigorous college-prep standards. Maintain a highly focused, academic environment within an accelerated setting, managing classroom dynamics with the professionalism expected at a premier private institution. Execute complex lesson plans with precision, utilizing deep subject-matter expertise to answer high-level student inquiries in Math and Science. Partner with the school faculty to ensure a seamless educational experience for students during this long-term transition.