Dr. Izquierdo's mian areas of expertise are Dual Language Competencies for Teachers and Leaders; Biliteracy: Factors that Influence, in its Development; Simultaneous Biliteracy Development; Leadership in Dual Language Education; Socio Cultural Competence in Dual Language Settings; District Wide Implementation of Dual Language Education, Pre-12th; Dual Language Policies for Districts, Transforming Schools for Emergent Bilinguals/ English Learners; Contrastive Analysis in Second Language Planning, Teaching, and Learning.