This dissertation explored the retention of career change Library Science students in an online, professional master's program. This study specifically examined retention through student motivations for career change, levels of self-regulation, and the deemed usefulness of Student Affairs services. This work explored Library Science career change, adult learner students as well as adding to the insufficient literature on retention of master's students in an online program. Key informant interviews, content analysis, and student surveys were used in a qualitative, case study. It was found that participants most utilized personalized communications such as emails and appointments followed by on-demand content, such as websites and recorded workshops. Other important factors for adult learner career change student success were community connections and alumni involvement. It is the determination of the researcher that these findings are generalizable to career changer adult learners enrolled in other, synchronous, online, professional masters' degree programs. [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.]