The purpose of this explanatory single-case case study was to investigate teachers' perceptions of a principal's leadership behavior associated with the integration of a one-to-one laptop program in a parochial secondary school. The sample included the school principal and teachers who have had at least one year of teaching experience at the parochial school with laptop computers. Owing to a mixed methods case study approach, data was collected from four sources: a semi-structured personal interview with the school principal, semi-structured personal interviews with teachers, a focus group interview with teachers, and teachers' completion with an electronic version of the Principal Leadership Questionnaire. These multiple forms of data were collected to support data-rich triangulation on the same set of research questions. SPSS was used to assist with data analysis of the electronic survey. Cronbach's alpha was used to determine the reliability of the instrument. Themes were extracted from the semi-structured personal interviews and focus group. The findings from this study provided teachers' perceptions of a principal's leadership behaviors associated with the integration of a one-to-one laptop program for students in a parochial secondary school.