Research supports the importance of student engagement in enhancing student learning, success, and various desirable educational outcomes. In the last decade, the National Survey of Student Engagement (NSSE) has been the primary instrument through which student engagement has been explored. "Supportive Campus Environment", one of the five benchmarks of effective educational practice measured by NSSE, served as the foundation for this study. The challenge of successfully educating students in science, technology, engineering, and mathematics (STEM) disciplines has been clearly documented. Recently, urgent calls have been issued to confront the shortage of students in the STEM pipeline, to minimize barriers to the achievement in STEM disciplines, and to increase the representation of racial minorities and women in STEM careers. This study employed a holistic collective case study design to examine how undergraduate men in STEM majors at a private, selective, research institution perceived the supportiveness of their campus environments. Differential perceptions of the campus environment on the basis of race (Black, Indian, Latino, and White) and academic success were explored. Cross-case analysis revealed several common themes across all cases. Peer relationships, followed by faculty relationships, were most influential in shaping perceptions of campus environment. Race, academic success, and characteristics unique to STEM were less influential to perceptions of the campus environment. Participants distinguished feelings of a supportive campus environment from their overall perceptions of their campus environment. Further, participants routinely isolated some of their identities, experiences, and perceptions from influencing their overall perception of the campus environment. A connection between the concept of supportive campus environment and sense of belonging emerged. Participants' discussion of the NSSE Supportive Campus Environment questions provided valuable insight into student perceptions and the NSSE instrument. Implications include recommendations for future research, considerations for NSSE administrators, researchers, and institutional users, policy and practice implications, suggestions for faculty, and considerations for those invested in STEM education. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]