Contact Us  

We are conveniently located across the street from Northridge Hospital Medical Center, as well as the Reseda Blvd/Roscoe Blvd bus stop.
Feel free to email us with any inquiries.


8:30 AM - 5:00 PM

phone (818) 727-7020

fax (818) 727-7075

phone (818) 727-7020

fax (818) 727-7075


8:30 AM - 5:00 PM

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Decibels & Hearing Loss

Posted on August 15, 2018 by angelica

The soft whisper of a grandchild sharing a secret, the loud blare of a fire truck’s siren as it enters the intersection, the soothing melody of your favorite song on the radio. How do we measure the intensity of the...
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Why You Should WEAR Your Hearing Aid

Posted on June 20, 2018 by angelica

According to the National Institutes of Health (NIH), only 20 percent of people who could benefit from hearing aids actually wear them. If you’ve taken the plunge and purchased hearing aids, congratulations! You’re part of an elite group. Do you wear them every day? Or...
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Hearing Aids Slow Down Cognitive Decline, Says New JAGS Study

Posted on June 6, 2018 by angelica

The relationship between cognitive ability and hearing aid use in older adults has drawn considerable interest over the past several years for obvious reasons:  Many nations around the world are coping with a growing aging population, along with many of...
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Trouble Hearing in Noisy Places?

Posted on May 23, 2018 by angelica

Many people have trouble understanding conversations in noisy situations. Scientists are beginning to understand why.  The problem is sometimes called “hidden hearing loss”: Standard hearing tests don?t measure it, and sufferers are often told their hearing is normal. But the distress they feel struggling...
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Hearing Loss in the School Setting

Posted on May 16, 2018 by angelica

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The Link Between Migraines and Hearing Loss

Posted on May 9, 2018 by angelica

Having an annual hearing evaluation is a good idea no matter how well you are hearing, but if you suffer from migraine headaches it may be even smarter to keep close tabs on your hearing health. Studies show that those...
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A Systematic Review and Meta-analysis re: Association of Age-Related Hearing Loss With Cognitive Function, Cognitive Impairment, and Dementia

Posted on March 28, 2018 by angelica

Numerous studies over the years have looked into the link between age-related hearing loss and cognitive decline and dementia. No doubt you’ve come across some of the findings: Adults with hearing loss experience a 30-40 percent faster decline in cognitive...
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FDA: “Don’t Get Burned: Stay Away From Ear Candles”

Posted on March 7, 2018 by angelica

A lit “candle” that can drip hot wax into your ear, usually as you lie on your side. Sound dangerous? The Food and Drug Administration (FDA) thinks so, and is warning consumers to steer clear of products being sold as...
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Protecting Your Hearing Means Protecting Your Mental Health

Posted on February 7, 2018 by angelica

By Carol Stoll and Lauren McGrath October is Protect Your Hearing Month—and, today, October 10, is World Mental Health Day, a time for mental health education, awareness, and advocacy. Hearing loss and tinnitus (ringing in the ears) can increase one’s...
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DIABETES: A Risk Factor for Hearing Loss

Posted on January 31, 2018 by angelica

There has been a link between diabetes and hearing loss since the 1960s, but no real pinpoint to a possible cause was found until just a few years ago. In 2008, the National Institutes of Health (NIH) conducted a study that showed...
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About Us


We appreciate the confidence you have expressed in our ability to deliver high quality healthcare. For more than 20 years our office has forged ahead as a leader in offering services you, and your neighbors, can trust. We are dedicated to providing excellent, compassionate care and to assist you during your vist. We hope this information answers many of your questions and concerns, so you feel more at ease during your visit. Please also note for your convenience, we also have 5 other locations in the Los Angeles and Ventura Counties that you may visit at any time (Insurance Coverage may vary).


Audiology is the branch of science that studies hearing (auditory), balance (vestibular), and related disorders. Practitioners who diagnose, treat, and proactively prevent related damage, are audiologists.

Audiologists are licensed professionals who hold a master's degree, Doctor of Audiology (Au.D.), or Ph.D. in the hearing sciences. Audiology license boards in each state determine the specific degree and experience requirements necessary to practice. As of January 2007 all professional training programs for audiologists in the United States culminate with the Au.D. (Doctor of Audiology) degree. Many state license laws now require the Au.D. degree for all newly licensed audiologists, and it is expected that eventually it will be required by all license laws in the United States. Audiologists who have earned the master's degree prior to the change in licensing standards are not required to earn a doctorate to continue practicing in the field. Audiologists have a clinical/educational background that emphasizes diagnostic evaluation of hearing and balance systems, amplification technology (especially hearing aids), hearing science, aural rehabilitation and assistive device fitting. Audiologists are trained extensively to evaluate and fit patients for hearing aids as treatment for various types of hearing loss.

Audiologists may specialize in pediatric diagnostics/amplification, cochlear implants, educational audiology, intraoperative neurophysiological monitoring, vestibular and balance issues, and/or industrial hearing conservation. Audiologists are also involved in the prevention of hearing loss and other communication disorders. Hearing Conservation programs in industry and government strive to prevent noise induced hearing loss through education and Audiologist intervention. Audiologists are often in charge of Newborn Hearing Screening programs designed to identify hearing loss within the first 4 months of life.

Hearing aid dispensers (Hearing Instrument Specialists, Hearing Aid Dealers) are not to be confused with Audiologists. Hearing aid dispensers must pass a state licensing written and practical examination in fitting hearing aids. Hearing aid dispensers work on a commission (in the United States of America). A Board Certified dispenser must have two years experience and pass a National Competency Examination. However, no college education is required.

How the Ear Works

Sound waves are collected by the outer ear and are funneled through the ear canal to the eardrum. Sound waves cause the eardrum to vibrate. Attached to the eardrum is one of the three bones found in the middle ear. These bones, called the ossicles, transmit and amplify the vibrations to the oval window of the inner ear. When vibrations enter through the oval window, the fluid in the inner ear creates a wave. These waves stimulate pitch specific nerve endings, called hair cells, which send an electrical impulse to the nerve. Electrical impulses are transmitted along the auditory nerve to the brain. The brain interprets the impulses into a meaningful message.

and Staff


Pictured Left to Right: Carolina Gonzalez (Audiology Assistant / Medical Assistant), Dr. Angelica O'Boyle (Audiologist), Dr. Gregory Frazer (President / Audiologist), Dr. Carissa Bennett-Frazer (Director of Operations / Audiologist), Betsy Balcaceres (Patient Care Administrator / Financial Coordinator)

Gregory Frazer
Gregory Frazer, AuD, PhD, CCC-A, ABA
President / Audiologist
Carissa Bennett Frazer
Carissa Bennett-Frazer, AuD, CCC-A
Director of Operations / Audiologist
Angelica O'Boyle
Angelica O'Boyle, AuD, CCC-A
Gregory Frazer

Gregory Frazer PhD, AuD, CCC-A, ABA

President, Audiologist, NBC-HIS Director of Audiology 2004-Present

Dr. Gregory Frazer entered private practice Audiology and Hearing Aid Dispensing in 1982. For 14 years he owned and operated Hearing Care Associates, which had 23 offices and was one of the largest audiology private practices in the U.S. Dr. Frazer is a well-known clinician and teacher, and was the first audiologist to obtain dual doctorates in Audiology, both a PhD. in Audiology as well as the new Clinical Doctorate of Audiology, the AuD. He was a UCLA Clinical Instructor and Chief of Audiology in the Department of Head & Neck Surgery at Olive View Medical Center 1984-1986, University of Florida AuD Audiology Instructor 1999-2010, AT Still University Adjunct Professor in Audiology 2001, UC San Diego/San Diego State University Adjunct Professor in Audiology 2008-Present, and Clinical Adjunct Faculty at University of Texas in Dallas 2011-present. He is Board Certified by the American Speech-Language-Hearing Association, American Academy of Audiology, and the National Certification in Hearing Instrument Sciences. Dr. Frazer specializes in the evaluation and treatment of vertigo, dizziness and hearing and balance disorders. Dr. Frazer is experienced in working with infants, children, and adults. He is semi-fluent in Spanish and Sign Language.

Carissa Bennett-Frazer

Carissa Bennett-Frazer, AuD, CCC-A

Director of Operations, Audiologist

Dr. Carissa Bennett graduated with honors from UC Santa Barbara in Speech and Hearing Science in 1978, obtained a Masters in Audiology from the University of Washington in 1981, and an AuD in Audiology from the Arizona School of Health Sciences in 2003. She was an Audiologist at the House Ear Clinic in Los Angeles from 1981-1986, with an emphasis on medical-legal audiology with Aram Glorig, MD, and conducted hearing aid research with James Sheehy, MD. She entered private practice in1986 with Dr. Gregory Frazer and co-owned and operated Hearing Care Associates. Dr. Bennett is experienced in working with infants, children, and adults, and specializes in diagnostic audiological evaluations. Dr. Bennett is Board Certified by the American Speech-Language Hearing Association. Her Hobbies are reading, music, and international cuisine.

Angelica O'Boyle

Angelica O'Boyle, AuD, CCC-A


Dr. Angelica O'Boyle graduated with honors from Marywood University in Communication Sciences and Disorders, with a concentration in Deaf Studies, in 2005. In 2009, she graduated summa cum laude from the Osborne College of Audiology at Salus University in Elkins Park, Pennsylvania with her Doctorate in Audiology. After graduating, she was a clinician at Princeton Eye & Ear, where she also managed the audiology department. She was additionally responsible for managing University Medical Center of Princeton's Audiology Department. She coordinated their newborn hearing screening follow-up program and played a key role in developing the hospital's "Dizzy Program". Dr. O'Boyle is also Board Certified by the American Speech-Language Hearing Association. She specializes in the evaluation and treatment of hearing, balance, and tinnitus disorders as well as advanced hearing device technologies. She has experience working with infants, children, and adults. Aside from audiology, she enjoys photography, and plays the piano and melodica.



Our office is conveniently located in the heart of the San Fernando Valley, in the City of Northridge. You can find us in the Northridge Medical Center, on the North Side, between Reseda Boulevard and Etiwanda Avenue.


18433 Roscoe Boulevard, Suite 204 Northridge, California 91325


The Medical Center has FREE Parking with guard on site.

Public Transport:

Reseda Blvd/Roscoe Blvd Bus Stop

Driving Directions

405 North, Exit 68: Roscoe Blvd. Turn left onto Roscoe Boulevard. You will drive approx. 4-5 miles, we are located on the Right hand side (between Reseda Blvd./Etiwanda Ave).

5 South to 405 South, Exit 68: Roscoe Blvd. Turn right onto Roscoe Boulevard. You will drive approx. 4-5 miles, we are located on the Right hand side (between Reseda Blvd./Etiwanda Ave).

101 South, Exit: Reseda Blvd. Turn left onto Reseda Blvd. You will drive approximately 3-4 miles. Turn right onto Roscoe Blvd. Our office will be on the Left hand side (between Reseda Blvd./Etiwanda Ave).

118 East, Exit 38: Reseda Blvd. Turn right onto Reseda Blvd. You will drive approximately 3-4 miles. Turn left onto Roscoe Blvd. Our office will be on the Left hand side (between Reseda Blvd./Etiwanda Ave).

Driving Directions

From Los Angeles Area:

405 North, Exit 68: Roscoe Blvd. Turn left onto Roscoe Boulevard. You will drive approx. 4-5 miles, we are located on the Right hand side (between Reseda Blvd./Etiwanda Ave).

From San Fernando Area:

5 South to 405 South, Exit 68: Roscoe Blvd. Turn right onto Roscoe Boulevard. You will drive approx. 4-5 miles, we are located on the Right hand side (between Reseda Blvd./Etiwanda Ave).

From Thousand Oaks Area:

101 South, Exit: Reseda Blvd. Turn left onto Reseda Blvd. You will drive approximately 3-4 miles. Turn right onto Roscoe Blvd. Our office will be on the Left hand side (between Reseda Blvd./Etiwanda Ave).

From Simi Valley Area:

118 East, Exit 38: Reseda Blvd. Turn right onto Reseda Blvd. You will drive approximately 3-4 miles. Turn left onto Roscoe Blvd. Our office will be on the Left hand side (between Reseda Blvd./Etiwanda Ave).

New Patient


Participating Medical Groups:
Health Care Partners, Facey, & Regal

Our company is contracted with these three medical groups, if your Insurance carrier is contracted with them, you must have an Authorization before a hearing test/balance test can be completed. It is imperative that you have an authorization prior to your appointment. If you are not sure, you may call our office or your insurance company.


We proudly accept the following Insurance Companies...

  • Aetna
  • Aftra
  • Beech Street
  • Blue Cross
  • Blue Shield
  • Coventry Health Care
  • Healthnet
  • Integrated Health Systems
  • Medicare
  • Motion Pictures
  • Pacific Care
  • PCHS
  • Secure Horizons
  • Screen Actor's Guild
  • Tricare
  • United Healthcare
  • Writer's Guild


If you have HMO Insurance, you must have an Authorization.

Please note: At this point in time, we are not a participating provider of Covered California policies.

We also take most private pay methods of payments, such as:

Cash, Checks, Cashier's check, Money Order, Debit cards, Visa, Mastercard, Discover & American Express. Financing options are available for the purchase of hearing aids.



Complete hearing testing for all ages provided by a certified clinical audiologist. Hearing tests evaluate and measure the sensitivity of a person’s sense of hearing. Audiologists employ various testing strategies to determine whether the auditory system is functioning within the normal range. Evaluations include measures of hearing sensitivity for air and bone conducted sounds, measures of speech discrimination ability, assessment of the middle ear function (impedance audiometry), and assessment of the inner ear function (otoacoustic emission testing). If hearing is deficient, testing can provide information about what type and degree of hearing loss is present.

Our office offers a wide variety of manufacturer's hearing instruments featuring the latest technology. We dispense technology as part of a hearing rehabilitation treatment plan for those with hearing loss. Our staff emphasizes ongoing cleaning and maintenance after your hearing aid purchase to insure you receive optimum performance and benefit from your hearing aids. Repairs are provided on all makes and models with loaner hearing aids available when necessary.

  • Phonak
  • Lyric
  • Starkey
  • Unitron
  • Resound
  • Widex
  • Oticon
  • Siemens
  • Many more...
  • BTE (Behind the Ear) - Traditional and Open Fit
  • ITE (In the Ear)
  • ITC (In the Canal)
  • CIC (Completely in the Canal)
  • IIC (Invisible in Canal)

If you are a Candidate for Hearing Aid(s), please note your Insurance Company may help cover the cost. We can also offer several Financing Options.

We also offer videonystagmography (VNG) test to help determine the status of the peripheral balance system located within the inner ear. The videonystagmography (VNG) is a series of tests used to evaluate the causes of a patient's dizziness or balance disorders. Together with an extensive case history, a VNG can decipher whether or not a patient may have an inner ear disease. If dizziness and/or imbalance are not caused by the inner ear, other areas such as the brain, migraines, and low blood pressure could be the source.

How does a VNG test work? VNG is short for videonystagmography. The name of the test is essentially describing that an audiologist will record eye movements using video goggles. Hi-tech video goggles with infrared cameras are worn during the test. These recordings are analyzed, looking for involuntary eye movements, called nystagmus, which is associated with inner ear disorders.

There are three main parts to the VNG. The first part is testing eye movement. This checks the patient’s ability to follow a visual target. The patient follows a dot on a screen. The second part is testing for dizziness related to certain positions and motion related cells. The patient will move in different positions, such as sitting, lying down, and turning the head. The last part of the VNG measures the vestibular portions of the ears. This test looks to see if the ears are responding normally and the function is balanced between the left and right ear. This is performed using cool and warm air in the ear canal. Throughout the test cameras record the patient’s eye movements and display them on a video/computer screen. This allows the examiner to see how the eyes move which is very helpful in assessing balance system health.

Treatment for balance problems is dependent on the cause, or possible causes of dizziness. Treatments may include specific exercises performed with an audiologist, balance retraining exercises performed at home, dietary changes, medication, and/or more...

In Benign Paroxysmal Positional Vertigo (BPPV) dizziness is generally thought to be due to debris, which has collected within the wrong part of the inner ear. This debris can be thought of as "ear rocks" or “crystals”, although the formal name is "otoconia". Otoconia are small crystals of calcium carbonate derived from a structure in the ear called the "utricle". The utrical and saccule, or “gravity detectors” use these crystals to pull their sensory cells toward the ground with gravity. (While the saccule also contains otoconia, they are not able to migrate into the canal system.) Crystals migrate into one of the semicircular canals. These three canals are the “motion detectors.” When the crystals enter they cause the sensory cells to react abnormally causing dizziness or imbalance.

The cause of BPPV is often unknown. The utricle may have been damaged by head injury, infection, or other disorder of the inner ear, or may have degenerated because of advanced age. Normally otoconia appear to have a slow turnover. They are probably dissolved naturally as well as actively reabsorbed by the "dark cells" of the labyrinth (Lim, 1973, 1984), which are found adjacent to the utricle and the crista, although this idea is not accepted by all (see Zucca, 1998, and Buckingham, 1999).

BPPV is a common cause of dizziness. About 20% of all dizziness is due to BPPV. While BPPV can occur in children (Uneri and Turkdogan, 2003), the older you are, the more likely it is that your dizziness is due to BPPV. About 50% of all dizziness in older people is due to BPPV. In a recent study, 9% of a group of urban dwelling elders were found to have undiagnosed BPPV (Oghalai et al., 2000).

The symptoms of BPPV include dizziness or vertigo, lightheadedness, imbalance, and nausea. Activities that trigger symptoms will vary among persons, but symptoms are almost always precipitated by a change of position of the head with respect to gravity. Getting out of bed or rolling over in bed are often common "problem" motions. Since people with BPPV often feel dizzy and unsteady when they tip their heads back to look up, sometimes BPPV is called "top shelf vertigo." Women with BPPV may find that the use of shampoo bowls in beauty parlors brings on symptoms. An intermittent pattern is common. BPPV may be present for a few weeks, then stop, and then come back again.

BPPV can be treated with specific exercises performed with an audiologist that move the crystals into an area that does not cause symptoms. BPPV can also resolve on its own by "dark cells" of the labyrinth actively absorbing the crystals.

All patients with tinnitus should have an audiometric assessment. Diagnostic testing should include audiography, speech discrimination testing, and tympanometry. A formal audiogram establishes a base from which to pursue more advanced diagnostic testing. Additional audiologic measurements of tinnitus include pitch matching (matching the frequency of the tinnitus with a variety of stimuli) and loudness matching (estimating the loudness of tinnitus with a pure tone or noise). Further measurements may provide information as to whether the tinnitus can be masked by an external noise. Treatment for tinnitus may include habituation training, masking devices and/or hearing aids.

Swim Earmolds: Used to prevent water from entering the ear while children with PE tubes are swimming and bathing. Swim molds are custom made to fit each individual ear providing maximum protection and come in a variety of fun colors.

Noise Protection Earmolds: Any kind of noise exposure is potentially damaging to hearing, so whether your noise exposure comes from your work environment or just mowing your lawn, custom earmolds can provide protection from noise-induced hearing loss. There are materials soft enough to be used while sleeping.

Musician's Products: Filtered earplugs reduce sound levels evenly so that music and speech are clear and natural, not muffled as with other earplugs. They reduce risk of hearing damage for many noisy occupations and noisy venues. They enhance the music experience for audiences while protecting hearing and lets musicians hear their own instrument to blend with others. Custom Monitors and custom headphones are also available.

We do offer range of Accessories for all types of Hearing Aids, If we don't have it in stock we can definitely order it for you!

  • Custom Made Ear Molds, Earplugs, Noise Plugs
  • Batteries, Battery Testers, Battery Caddies
  • ASSITIVE DEVICES: TV Listening Devices, TV Ears, FM Systems, Pocket Talkers, Telephone Amplifiers, Streamers, Chargers, Audio Induction Loops, Infrared Systems, etc.
  • ITEMS FOR HEARING AID MAINTENANCE: Hearing Aid Cleaning Supplies, Hearing Aid Saver Kits, Dri Aid Kits, Earmold Tubing Blowers, Moisture Covers, Super Seals, Ear Bands