There is a gender gap among females studying STEM (Science, Technology, Engineering, and Math) majors and pursuing STEM careers. More males than females pursue these majors and careers. This study explored how high school counselors influence the choices of STEM majors for female students. The researcher explored the perspectives of seven experienced high school counselors who work with students on college exploration and career planning activities in this multi-case study. The processes these counselors apply when working with female students and improving these practices so school counselors can better support their students was examined. Key findings of this study suggest that school counselors play critical roles in helping their students explore college and career options. It is essential to establish a relationship between each student and their school counselor to serve each student individually. Counselors are aware of this gap and are interested in decreasing it. They are interested in learning more about STEM-specific majors to serve their students best. They offer suggestions on specific and relevant training opportunities to help them continue learning. They are eager to help their students, as well as their colleagues, learn and grow within their professions. [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://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]