David V. Wagner, MD is the Medical Director of the Voice Clinic at Mercy Medical Center-Sioux City. Dr. Wagner is a practicing otolaryngologist (ear, nose, throat or ENT) in Sioux City, IA. He received his medical degree from the University of Iowa in 1987. He completed his internship and residency at the University of Washington in Seattle and the University of Kansas Medical Center in Kansas City, KS. After completing his otolaryngology training, he pursued advanced training in head and neck oncologic and reconstructive surgery at the University of Iowa. The Voice Clinic at Mercy Medical Center-Sioux City is an outgrowth of Dr. Wagner's strong interest in vocal disorders.

Dwight L. Birkley, PA-C received a Bachelor of Science in Nursing from Briar Cliff College in 1983. He obtained a Master of Science in Administrative Studies from the University of South Dakota in 1994. He was certified as a physician assistant through the University of North Dakota 1998. Prior to coming to the Voice Clinic, Dwight gained extensive experience in health care in the Emergency Department at St. Luke's Medical Center in Sioux City. He served as nursing director at St. Luke's from 1986-1992 and as outreach manager at St. Luke's from 1992-1997. Dwight is a member of the American Academy of Physician Assistants.

Jacqueline Nagel, CCC-SLP received a Masters of Arts degree in Communication Disorders from the University of South Dakota in 1989 and the American Speech and Hearing Association (ASHA) Certificate of Clinical Competency in 1990. She is licensed to practice in the states of Iowa and Nebraska.  She currently works through the Mercy's Physical Medicine and Rehabilitation Unit in Sioux City, IA. Her responsibilities include performing a variety of diagnostic evaluations and therapeutic techniques with speech and voice patients of all ages. She is a dedicated member of the Voice Clinic team at Mercy Medical Center-Sioux City and is co-facilitator of Mercy's Voice Disorders Support Group.

Julia Goth-Avery, CCC-SLP received a Masters of Arts degree in Communication Disorders from the University of Northern Iowa in 1987. She obtained here Certificate of Clinical Competency in 1988 through ASHA. Julia is employed with the Speech Pathology and Audiology Department of the Mercy's Physical Medicine and Rehabilitative Unit in Sioux City. Her experience includes working with patients suffering from various neurologic communication disorders. She is a dedicated member of the Voice Clinic team at Mercy Medical Center-Sioux City.