Dr. Guntzviller has broad interests in interpersonal, family, and health communication, mainly with underserved populations (e.g., low-income, minority). Her research focuses on language brokering: when bilingual (English- and Spanish-speaking) children/adolescents linguistically and culturally mediate for their primarily Spanish-speaking mothers. She also studies social support processes, particularly in the context of giving advice, such as parent-to-child advice on health issues. Additionally, she has also published on patient-provider communication when the patient has communication difficulties (e.g., low English proficiency, low health literacy). Her research has often utilizes dyadic data and employs a multiple goals framework.