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Colleen Kelleher Zenczak, Au.D.

Photo of Dr. Colleen Kelleher Zenczak, Au.D.


Assistant of Otolaryngology - Head and Neck Surgery

Specializes in: Adolescents (12-18 years), Children (1-11 years), Adults (18+ years), Geriatrics (55+ years)

Expertise: Digital Hearing Aid Technology, Electrophysiology, Hearing Aids, Osseointegrated Sound Processors (BAHA System), Pediatric Diagnostic Audiology and Hearing Aids more


Johns Hopkins Health Care and Surgery Center
Appointment Phone: 443-997-6467

6420 Rockledge Drive
Suite 4920
Bethesda, MD 20817 map
Phone: 301-896-3332
Fax: 301-530-2650

Johns Hopkins Outpatient Center
Appointment Phone: 443-997-6467

601 N. Caroline St.
6th Floor
Baltimore, MD 21287 map


Colleen K. Zenczak, Au.D., CCC-A earned her doctorate in audiology from Washington University in St. Louis and a bachelor’s degree in biology from the University of Rochester.  She completed her doctoral dissertation in the area of sequential bilateral cochlear implantation in children with severe to profound hearing loss.

Dr. Zenczak is trained in the field of audiology with a Certificate of Clinical Competence in Audiology (CCC-A) from the American Speech Language Hearing Association.  She offers audiologic services for pediatric and adult patients, including comprehensive audiologic evaluation, auditory brainstem response (ABR) testing, otoacoustic emission testing, hearing aid selection and fitting using real ear measurement and osseointegrated bone anchored devices. more


  • Audiologist
  • Assistant of Otolaryngology - Head and Neck Surgery



  • B.S., University of Rochester (New York) (2009)
  • Au.D., Washington University School of Medicine - St Louis (Missouri) (2017)

Research & Publications

Selected Publications

View all on Pubmed

Bok, J., Zenczak, C., Hwang, C. & Wu, D. (August 20, 2013). Auditory ganglion source of Sonic hedgehog regulates timing of cell cycle exit and differentiation of mammalian cochlear hair cells. Proceedings of the National Academy of Science, 110 (34): 13869-13874.

Activities & Honors


  • American Speech Language and Hearing Association 2017
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