This study was designed to use Herzberg's motivation-hygiene theory to investigate the different levels of job satisfaction among adjunct college instructors at eight institutions of higher education located in southeast Texas. Differences in job satisfaction were measured by instructor gender, ethnicity, age, teaching experience, type of course taught, and institution of employment. Using survey methodology, data were collected from 496 adjunct instructors teaching during the fall 2010 semester. Data were analyzed using t-test and one-way between groups analysis of variance, ANOVA. Results of the study showed significant differences only when comparing the different adjunct instructor years of teaching experience. For administrators in higher education, these findings may provide direction in ways to improve adjunct instructor job satisfaction. [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.]