Dr. Lambert’s scholarship addresses issues related to assessment for children with disabilities within special education and related fields (e.g., school psychology, mental health, social work) with a particular focus on psychodiagnostic testing, strength-based assessment, and cross-cultural test adaptations. His work often addresses long-standing issues of inequity in special education and the role of assessment in either reducing or exacerbating disproportionality for culturally, linguistically, and ethnically diverse students. Some of his recent work has taken an epidemiological approach to study long-term population trends in the behavioral and emotional characteristics of children with disabilities and their peers without disabilities. His scholarship has been supported by grants from the Institute of Education Sciences, National Institutes of Health, Office of Special Education Programs, and the Office of Innovation and Improvement.