National Stuttering Association

The National Stuttering Association Research Committee consists of qualified speech-language pathologists as well as qualified related professionals and consumers. In addition, the Committee is headed by a Chair representing the NSA Board of Directors and Professional Relations Committee.


Meet the NSARC:


Our NSARC is chaired by Dr. Angela Medina, an assistant professor in the Department of Communication Sciences and Disorders at Florida International University in Miami, Florida. Angela earned her PhD in Applied Language and Speech Sciences from the University of Louisiana at Lafayette where she also completed her coursework for certification as a speech-language pathologist. Since 2015, she has served as the NSA Miami Chapter Leader. Dr. Medina has published and presented her research nationally and internationally on stuttering in Hispanic, Latino/-x, and Spanish-English bilingual communities. Her research interests include the stuttering experiences of adults, culturally and linguistically diverse populations, mindfulness, and qualitative research methods. Her hobbies include baking and gardening with her 3-year-old twin daughters, playing fantasy football, running, and practicing archery. She is a loyal New Orleans Saints fan and music trivia enthusiast.



Our NSARC is co-chaired by Nathan Maxfield.  Nathan is a person who stutters, proud husband and dad, and Associate Professor in Communication Sciences and Disorders at the University of South Florida (USF), one of three research universities designated Preeminent by the State of Florida. Nathan directs the Stuttering Intervention and Research Lab at USF. He supervises services for children and adults who stutter in the USF Speech Clinic, and directs the summer intensive Program for Advanced Treatment of Stuttering (PATS). Nathan has co-hosted NSA-Tampa chapter meetings since 2008, along with organizing USF/NSA “Speech Party” events for children who stutter and their families. Nathan has served on the Editorial Board for the Journal of Speech-Language-Hearing Research, and has been fortunate to receive National Institutes of Health funding to support his research.

Current committee members include:


  • Angela M. Medina, PhD, CCC-SLP1
    Research Committee Chair
    (term expires February 2024)
  • Michael P. Boyle, PhD, CCC-SLP1
    (term expires November 2023)


  • Shanley Belle Treleaven, PhD, CCC-SLP1
    (term expires September 2023)
  • Danielle Werle, PhD, CCC-SLP1
    (term expires September 2023)



Ad Hoc Review Committee:

  • Derek E. Daniels, Ph.D., CCC-SLP
  • Paula D’Arcangelo, M.S., CCC-SLP
  • Dominique Kennedy, M.S., CCC-SLP
  • Katerina Ntourou, Ph.D., CCC-SLP
  • William (Will) Webster, Ph.D.


The make-up of the Research Committee is meant to reflect a blending of qualified speech-language pathologists (1), and qualified related professionals and consumers (2). We acknowledge each committee member’s time and contributions to the work of NSARC.

Updated as of 9/22