This study explored the epistemological beliefs of the science faculty at a small liberal arts college in the Southern United States and investigated the effect of a Faculty Learning Community (FLC) professional development (PD). The teacher beliefs interviews (Luft and Roehrig, 2007) were used to investigate epistemological beliefs of faculty from various science, technology, engineering, and mathematics (STEM) disciplines for three semesters. The faculty members were grouped into two categories: Those who participated in PD (treatment group) and those who did not (comparison group). Further, classes for all the faculty members who participated in the interviews were observed during the same period to compare beliefs and practices. Reformed teacher observation protocol (Piburn and Sawada, 1995) was used to rate the observations. Results indicate the STEM faculty at this college had transitional beliefs. Further, a significant difference was observed between the classroom observations of FLC participants and the comparison group. Significantly, a high correlation was found between faculty beliefs and practice. Results from this study add to the current understanding of faculty beliefs and practice.