This qualitative, explanatory single-case study explored how online adjunct faculty who teach in a private, faith-based school versus a private, non-faith-based school explain their motivations to teach online courses. The study utilized Vroom's Expectancy Motivation Theory as the theoretical framework. Two research questions guided the study. The first question asked how do online adjunct faculty who teach in a private, faith-based school explain their motivations to teach online courses? The second question asked how do online adjunct faculty who teach in a private, non-faith-based school explain their motivations to teach online courses? The study's sample included 35 adjunct faculty instructors who teach online classes in either private faith-based or private non-faith-based institutions in the United States. Participants recruited through Facebook completed an online questionnaire. Volunteers from questionnaire responses participated in individual interviews and two focus groups, one consisting of adjunct faculty teaching online classes in private, faith-based schools and one focus group consisting of adjunct faculty teaching online classes in private, non-faith-based schools. Themes emerging from the data included: positive experiences of online teaching, learning outcomes of online students, training and collaboration, and barriers decrease motivation. Participants explained being motivated to teach online courses by the positive experiences gained from teaching part-time and by being able to help students achieve academic outcomes. Additionally, participants explained being motivated by training and collaboration opportunities. Conversely, participants revealed various barriers to teaching online classes as hindrances and factors likely to discourage them from seeking adjunct teaching opportunities. [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.]