The purposes of this study were to determine whether differences existed between the communication styles and teaching effectiveness, respectively, of native and non-native teaching fellows, as perceived by their undergraduate students. In addition, the study sought to determine whether a positive correlation existed between the final grades and the communication styles and teaching effectiveness, respectively, of native and non-native teaching fellows as perceived by their undergraduate students. In order to carry out the purposes of this study, six hypotheses were tested concerning the perception of native and non-native undergraduate students toward the communication style and teaching effectiveness of teaching fellows in North Texas State University.