Research interests and areas of expertise:
Design-based research; inquiry-based and design-based learning; technology-enhanced learning environments; conceptions of teaching and learning.

Research interests and areas of expertise:
Special education; literacy and math interventions for K-12 students with disabilities; culturally responsive pedagogy; international special education; data-based decision making; research and statistics.

Research interests and areas of expertise:
Research on teaching and instruction, particularly the effects of class composition on student learning; research methodology; statistics.

Research interests and areas of expertise:
Education statistics and research methods: meta-analysis, nonparametrics methods applied to analysis of single-case data, randomization tests, test construction, and performance assessment; assessment in higher education; teaching statistics; and teaching in higher education.

Research interests and areas of expertise:
Multimedia learning, mathematics education, and student motivation to learn.

Research interests and areas of expertise:
Collaborative teaching; inclusive classrooms; special education teacher training.

Research interests and areas of expertise:
Social and philosophical foundations of education; the educational philosophy of Paulo Freire; educational issues of the third-world or oppressed populations; international education.