This study sought to determine the beliefs that tenured, in-service high school science teachers hold about how their participation in a large mid-Atlantic university's 6-week summer research experiences for teachers (RET) program might influence their pedagogical practices. The findings show a number of factors that teachers believed helped them to be successful during their summer RET program that center on science content knowledge, laboratory experiences, cognitive skills, and mentor dispositions. Teachers further believed that the successes they experienced during their summer RET program influenced how they would plan to teach their own students science. The findings suggest that having science teachers conduct research might help to facilitate changes in their beliefs about their pedagogical practices.