The Pathfinder program aims to help the first astronaut teachers fly in space and return to the classroom. These Pathfinders will also help design the three-week training course for the large number of teachers who follow. We hope that Pathfinders also may have the opportunity to return each summer to help teach the course. Currently, two positions for Pathfinders are open, for Pathfinders with strengths in STEM, and lesson plan development, with more slots to follow. Applicants for the STEM Pathfinder slot are asked to submit a proposal for an experiment that could be performed on a suborbital flight. Lesson plan development applications are asked to submit a lesson plan or curriculum module based on any aspect of human spaceflight. Teachers from all subject areas, STEM and non-STEM, are encouraged to apply.