Learn About Los Gatos Audiology and Hearing Aid Center
Los Gatos Audiology and Hearing Aid Center is proud to provide exceptional audiological care to our patients in Los Gatos, the Bay Area, and beyond. By offering the latest technologies in hearing aids and utilizing cutting-edge instrumentation, we have become the most trusted provider of hearing improvement services. Furthermore, we serve as a testing site for brand-new technologies and products.
We have based our practice around a patient-oriented philosophy, as we believe that by taking your lifestyle, hearing loss, and perceptions into consideration, we will obtain the optimal hearing aid fitting for you. Each member of our staff is well versed about hearing loss, creating a comfortable and stress-free atmosphere.

Ellen Mosher
Audiologist Ellen Mosher is the owner of Los Gatos Audiology and Hearing Aid Center. For over 30 years, she has provided audiologic care for patients with hearing impairments and has become the Bay Area’s leading and most reliable audiologist.
Ellen received her Bachelor of Science in Speech Pathology and Audiology in 1974 and her Master of Science in Audiology in 1976 from Boston University.
Because of her extensive experience and knowledge in the field of audiology, she has presented papers and lectures at numerous national audiologic conferences, has had many articles and studies published, and has been selected to serve as a beta tester for many innovative audiological technologies. To share her wealth of knowledge and experience, Ellen has taught continuing education courses throughout her 30-year career.
Professional Organizations
- American Academy of Audiology
- American Speech-Language Hearing Association
- California Speech-Language Hearing Association
- California Academy of Audiology
Professional Licenses
- State of California Audiology (1977-present)
- State of California Hearing Aid Dispensing (1979-present)
- American Speech Hearing and Language Association; Certificate of Clinical Competence in Audiology (1977-present)
Honors and Awards
- October 7, 2004 to present, State of California, State and Consumer Services Agency, Speech-Language Pathology and Audiology Board, volunteer subject matter expert
- Beta test site for Frye Electronics Fonix 6500 digital software, August, 1998
- Beta test site for Siemens Prisma digital hearing aid, January, 1998
- Governor Appointee as an audiology member to the State of California Department of Consumer Affairs, Medical Board, Speech Pathology and Audiology Examining Committee (1986-1993)
- United States Department of Education Fellowship (1974-1976)
- Boston University Trustee's Scholarship (1972-1974)
Publications and Presentations
- "Documenting Hearing Aid Utilization Review and Satisfaction" presented at the annual American Academy of Audiology (April 30, 1999; Miami, FL) Feature speaker on digital case histories, Siemens International Hearing Aid Symposium, (June 26, 1998; Rome, Italy)
- "Practical Techniques and Protocols for Electro-Acoustic Measurements of Digital and Advanced Sound Processing Hearing Aids, Evaluating Performance, Verifying Fittings, and Trouble Shooting" presented at the annual American Academy of Audiology (April 3, 1998; Los Angeles, CA)
- Audiological Panelist for Sonix Technologies, (September 1997)
- "Comparisons of Filter Placement in the Earhook versus CFA Tubing" presented at the annual American Speech-Language Hearing Association Convention (December 9, 1995; Orlando, FL)
- "Management of Otitis Media in Children" presented as a faculty member at the American Academy of Pediatrics (October 18, 1995; San Francisco, CA)
- Lecturer "Programmable Hearing Aids" and panel member for a continuing education course for the State of California sponsored by Siemens Hearing Instruments (May 18, 1995; Burlingame, CA)
- "Testing Protocols for Earplug Attenuation and Comparative Data for Custom Earplugs and EAR Earplugs" presented at the American Speech Hearing Language Association Convention (November 19, 1994; New Orleans, LA)
- "Restaurant Noise, Hearing Loss and Hearing Aids", Western Journal of Medicine, Vol. 161 (July, 1994)
- "Otologic Aspects of Restaurant Noise" presented at the American Otologic Society (April, 1993; Los Angeles, CA)
- "Restaurant Noise: 'What Was That You Said'," Hearing Instruments, Vol. 44, No. 10 (December, 1993)
- "Multiparametric Evaluations of Multiband Compression Hearing Aid Fittings" presented at the American Speech Language Hearing Association Convention (November 22, 1992; San Antonio, TX)
- "Matching Hearing Aid Technologies to Client Needs," presented at a Continuing Education Seminar for the State of California (May 16, 1992) – Seminar organized and directed by Ellen Mosher and Susan Jelonek
- "Real Ear Measurements of Noise and Aided Performance in Noise" presented at the American Speech Language Hearing Association Convention (November 24, 1991; Atlanta, GA)
- Presenter of the Case History Segment of "Multi-Signal Processing Hearing Aids" at the California Speech Language Hearing Association Convention (April 1990; Monterey, CA)
- Multiband Signal Processing Hearing Aids: Practical Fitting Strategies, Hearing Journal, Vol. 42, No. 7, (July 1989)
Tak Katsumoto
For over 40 years, hearing instrument specialist Tak Katsumoto has designed fit and repaired hearing aids. His work in the hearing aid industry has enabled him to gain valuable knowledge about hearing aid technologies and repairs.
With the help of Tak Katsumoto, a hearing aid specialist and dispenser, the Los Gatos Audiology and Hearing Aid Center has helped thousands of patients of all ages to communicate more easily with family and friends, thereby effectively improving their quality of life.
Our Office
Our goal has always been to provide you with the best possible care. By diagnosing the impairment, educating you of the everyday implications of hearing loss, and offering effective, cutting-edge solutions, we do our best to fulfill our obligation to you as your trusted hearing health care professionals. Our office is equipped with a comprehensive set of state-of-the-art instruments to ensure that you receive the highest quality of care.
Services
In keeping with our mission to provide the most comprehensive audiological care possible, we offer a wide range of services, including:
- diagnostic audiology;
- hearing aid consultations;
- hearing aid fittings;
- customized musicians’ plugs and sound suppressors;
- second opinions; and
- medical legal evaluations.
If you would like to receive any of these services or learn more about the other services we offer, please contact our office today to schedule an appointment.