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Callier Center for Communication Disorders


Thomas F. Campbell, PhD

Ludwig A. Michael, MD, Executive Director
Sara T. Martineau Professor in Communication Disorders

As Executive Director of the Callier Center for Communication Disorders, Dr. Campbell sets the strategic vision of the organization and oversees the center’s treatment, training and research efforts. Dr. Campbell brings extensive experience as a speech-language pathologist and has an advanced Board Certification in neurological communication disorders through the Academy of Neurologic Communication Disorders and Sciences. His research focuses on the identification of physiological, environmental and genetic variables for the early identification of speech and language disorders in children. Dr. Campbell is a trustee of the American-Speech-Language-Hearing Foundation. He joined the faculty at UT Dallas as a professor in the School of Behavioral and Brain Sciences and as executive director of the Callier Center in 2006.

Thomas Campbell

Tricia George

President, Foundation for the Callier Center

As President of the Foundation for the Callier Center, Mrs. George spearheads the separate 501(c)3 organization that serves as an advisory committee to the president of The University of Texas at Dallas and to the executive director of the Callier Center. Mrs. George began her term as president in 2017 and has been a board member since 2004. The foundation’s mission is to increase recognition of the Callier Center in the community and within The University of Texas System, as well as to help carry out fundraising activities. Mrs. George is the owner/manager of Georges Creek Ranch and a community volunteer.

Tricia George

Justin Banta, MDiv

Senior Director of Development

As senior director of development, Mr. Banta oversees the fundraising and communications efforts for the center. He liaisons with the Foundation for the Callier Center board of trustees to strategically engage the community through private funding, grants, special events and communications. Mr. Banta also manages the execution of the center’s major and annual giving programs, stewardship and outreach.

Justin Banta

Carol Cokely, PhD, F-AAA, CCC/A

Clinical Professor and Director of Clinical Education

As Clinical Associate Professor and Coordinator of Clinical Teaching, Dr. Cokely develops programs within the Doctor of Audiology (AuD) Program within the School of Behavioral and Brain Sciences to enhance and evaluate the quality of clinical education in audiology at the Callier Center. Dr. Cokely teaches courses in adult aural rehabilitation, research methods and counseling. Her continued research areas include auditory rehabilitation and clinical teaching methods. Dr. Cokely serves on the Board of Directors of the American Academy of Audiology (AAA) and the Academy of Rehabilitative Audiology, as past president.


Andrea Gohmert, AuD, CCC/A

Director of Audiology Clinical Operations

As Director of Audiology Clinical Operations, Dr. Gohmert manages the hearing services division and a staff of audiologists who serve children and adults with hearing impairment. She has over 25 years of experience in audiology working exclusively in the medical field. She has worked with skilled neuro otologists in Dallas and Virginia. Her areas of expertise include vestibular disorders, electrophysiology, medical audiology and cochlear implants. Dr. Gohmert also serves as a clinical member of the faculty instructing students in various areas of audiology.

Andrea Gohmert

Colleen Le Prell, PhD

Program Head, Audiology AuD
Emilie and Phil Schepps Professorship in Hearing Science

As Program Head of Audiology, Dr. Le Prell oversees the Doctor of Audiology (AuD) Program within the School of Behavioral and Brain Sciences. Dr. Le Prell holds the Emilie and Phil Schepps Professorship in Hearing Science, and is one of the leading researchers in the area of hearing loss prevention. Her work has emphasized the identification of cell death pathways activated by noise, and assessment of therapeutic agents that prevent cell death and hearing loss. Dr. Le Prell teaches courses in evidence-based practice and hearing loss prevention. She is the former director of education for the National Hearing Conservation Association, and is currently an active participant in the Department of Defense Hearing Center of Excellence Pharmaceutical Interventions to Prevent Hearing Loss working group.

Dr. Colleen Le Prell

Jan Lougeay, MA, CCC/SLP

Director of Clinical Education

As Director of Clinical Education, Ms. Lougeay manages the clinical education for speech-language pathology students through programs designed to provide experiences that will enhance clinical skills in working with specific populations, and provide students with the background and knowledge base to develop as master clinicians. Ms. Lougeay’s research interests center on outcomes in clinical education of students. She also serves as a clinical faculty member in the areas of stuttering, autism, early childhood intervention and voice disorders, and provides continuing education to practicing professionals.


Jodelle Oakley, MS

Director, Education Division

As Director of the Education Division, Ms. Oakley leads the Child Development Program at the Callier Center. The program is accredited by the National Association for the Education of Young Children and licensed by the state of Texas. The program includes tuition-based child care service, kindergarten and public school deaf education in collaboration with The University of Texas Southwestern Medical Center and the Dallas Independent School District. Ms. Oakley has an extensive background in early childhood education administration, leadership and staff development to support quality services for families with children ages birth to five years old.

Jodelle Oakley

Donise Pearson, MS, CCC/SLP

Director of Administrative Operations and Special Projects

As Director of Administrative Operations and Special Projects, Ms. Pearson ensures implementation of internal and external policies and procedures, serves as the center's HIPAA privacy officer, manages centerwide quality improvement programs and develops community and University relationships. She is a speech-language pathologist and a former president of the Texas Speech-Language-Hearing Association. Ms. Pearson received the American Speech-Language-Hearing Association Fellow recognition in 2008, and has worked as a clinician and administrator at Callier since 1989.


Ross J. Roeser, PhD, CCC/A

Executive Director Emeritus
Lois & Howard Wolf Professor in Pediatric Hearing

Dr. Roeser began his career at Callier in 1972 when he was appointed chief of audiology at what was then called the Callier Hearing and Speech Center. In 1975, when Callier became a component of UT Dallas, he was appointed assistant professor in communication disorders and is now a full professor. In 1988, he was promoted to executive director of the Callier Center and held the position until 2006. He now holds the Lois and Howard Wolf Professorship in Pediatric Hearing in the graduate program in Communication Disorders. Dr. Roeser is a Fellow of the American Speech-Language-Hearing Association and the American Academy of Audiology. His research interests lie in the application of hearing instrument technology to improve communication.


Robert Stillman, PhD

Associate Dean, Graduate Studies
Program Head, Communication Sciences and Disorders

As Associate Dean of Graduate Studies and Program Head of Communication Sciences and Disorders, Dr. Stillman oversees the undergraduate, master's, and PhD programs in communication sciences and disorders, and coordinates all of the graduate programs in the School of Behavioral and Brain Sciences. Dr. Stillman’s research relates to the cognitive and interpersonal factors influencing communicative development in children with Autism Spectrum Disorder (ASD) and other severe communication impairments.

Robert Stillman

Melissa H. Sweeney, MS, CCC/SLP, LSLS Cert. AVT

Head of Speech-Language Pathology and Cochlear Implant Program Manager

As Head of Speech-Language Pathology, Ms. Sweeney manages a team of speech-language pathologists who provide evaluations and innovative treatments for patients with speech, language and feeding/swallowing disorders. As manager of the Cochlear Implant Program, Ms. Sweeney leads a team of audiologists and speech-language pathologists who provide candidacy information, evaluations, and post-surgical follow-up services for children who receive cochlear implants. Ms. Sweeney represents Callier in the Dallas Cochlear Implant program, a collaborative effort of the combined resources of Children’s Medical Center, The University of Texas Southwestern Medical Center and the Callier Center for Communication Disorders. She is responsible for coordinating the services among these institutions. Ms. Sweeney is a certified auditory-verbal therapist, and she specializes in cochlear implantation and hearing impairment.