Meet Our Team

Holli Lish, Au.D.

Holli Lish, Au.D.

Doctor of Audiology

Dr. Holli Lish is a board-certified audiologist with over 27 years of audiology experience. Holli’s impressive range of experience includes work in hospitals, schools, clinics, and private practices, where she has developed a reputation for expert, personable, and compassionate care.

Holli is a fellow of the American Academy of Audiology, The Pennsylvania Academy of Audiology, and the American Academy of Doctors of Audiology and certified through the American Speech-Language-Hearing Association.

Holli’s received a Doctorate in Audiology from A.T Still University, a Master of Arts degree from Temple University, and a Bachelor of Arts degree from the University of Florida.

Besides helping people improve their lives through better hearing, Holli’s other passions include fitness, good food, and spending time with her husband, Jeff, and their two sons.

Maryann McCullough Nikander, Au.D.

Maryann McCullough Nikander, Au.D.

Doctor of Audiology

Dr. Maryann McCullough Nikander is a board-certified audiologist with 36 years of audiology experience, including time spent as an instructor for Temple University’s master’s degree program. However, much of her experience has been devoted to helping her patients hear better through compassionate, individualized care.

Maryann is a fellow of the American Academy of Audiology, The Pennsylvania Academy of Audiology, and the American Academy of Doctors of Audiology, in addition to being certified through the American Speech-Language-Hearing Association. She had the pleasure of serving as the 2019 President of the Pennsylvania Academy of Audiology.

Maryann received a Doctorate in Audiology from Salus University, a Master of Arts degree from Temple University, and a Bachelor of Arts degree from the University of Pittsburgh.

In addition to Maryann’s impressive experience, her patients know her as outgoing, funny, and caring. Just ask her, and she’ll tell you all about her latest hiking trip, her outdoor adventures, or her upcoming travel plans with her husband, six children, and three grandchildren.

Marisa Fassnacht, Au.D.

Marisa Fassnacht, Au.D.

Doctor of Audiology

Dr. Marisa Fassnacht is a board certified audiologist. Marisa’s educational experience includes Doctorate in Audiology from Salus University and a Bachelor of Arts degree from Temple University. Marisa has had clinical experience working in hospitals and private practices, with pediatric and geriatric populations, evaluating and treating hearing loss.

Marisa has personal experience with hearing loss, which allows her to connect with her patients and provide exceptional and personable care.

Aside from providing excellent care to her patients, Marisa enjoys talking about her family, cooking, watching Philadelphia sports, and taking trips to the Jersey Shore.

Andrea Mihalich, MBA

Andrea Mihalich, MBA

Practice Manager - Audiology Assistant/Hearing Instrument Specialist

Andrea Mihalich is the practice manager for Audiology & Hearing Aid Center and an audiology assistant and hearing instrument specialist. While she still loves seeing patients on occasion, she focuses on the practice’s day-to-day operations, including marketing and insurance.

Andrea received a Master of Business Administration in Healthcare Administration from Gwynedd Mercy University and a Bachelor of Arts degree in Speech-Language and Hearing Science with a Minor in Psychology from Temple University. Andrea is a Registered Hearing Instrument Specialist in Pennsylvania and has trained and worked as an audiology assistant for several years. 

Andrea enjoys spending time with friends and family, exercising, gardening, and playing with her dog Guy and cat Bronn in her free time. 

Kristina Tregnan

Kristina Tregnan

Patient Care Coordinator

Kristina earned an Associate of Arts degree in Graphic Design and a Certificate in Applied Photography from Bucks County Community College. Kristina has over 27 years of experience working as an administrative professional in hospital and office settings, including critical care, medical/surgical, orthopedic/trauma, rehabilitation, and currently audiology. She provides friendly, high-quality, and timely support to our patients.

Kristina enjoys spending her free time writing poetry or fiction, photographing Bucks County’s charming countryside including beautiful landscapes, historical buildings, various wildlife, and gorgeous sunsets. She cherishes the time spent with her family and friends.


Gary Lachow
Gary Lachow
2022-06-27
People often say “I don't have time to write reviews”, but I couldn’t pass up the opportunity to help others by sharing my mother’s WONDERFUL experience with Dr. Marisa Fassnacht, an extremely knowledgeable, compassionate and upbeat audiologist. Dr. Marisa truly cared about helping my mom, who previously had been to several audiologists but never trusted them. My mom has been having trouble with her hearing aids which didn’t seem to be helping much lately. Dr. Marisa demonstrated the utmost patience by listening to all of my mom’s questions and concerns and thoroughly answering each one of them. After making the necessary adjustments to her hearing aids, Dr. Marisa provided practical tips on how my mom could communicate and interact with people to slowly build up her confidence. My mom recently told me that she feels she is gaining her life back, hearing loved ones and becoming a more active participant in conversations. I wholeheartedly recommend Dr. Marisa, and the entire exceptional team at the Audiology and Hearing Aid Center. My mom will definitely be seeing Dr. Marisa again when she is ready for her next set of hearing aids, as she has finally found an audiologist she trusts!
earl sigmund
earl sigmund
2022-06-15
In my opinion there is no firm better to diagnose and care for your hearing issues than Dr Holi Lish and her staff at AHAC. I am a perfectionist and demand great customer service. I get that and more with Dr Lish and her staff. The process of just getting hearing aides and learning to use them properly is a daunting experience in itself - you just naturally feel old. The process used at AHAC takes all the anxiety and stress out of the hearing aide purchase and the proper use of the equipment. Contact DR Lish and you will see what I mean.
Barbara MannBarbaraM
Barbara MannBarbaraM
2022-06-01
What a journey and a joy it has been rediscovering sound after getting hearing aids from Audiology & Hearing Aid Center in Warminster, PA. I knew I had hearing loss but didn’t realize how just bad it is, and I’ve had nothing but delightful times getting used to being able to hear again. To carry on conversations with my friends again in public or private, inside or out, even in the phone, and be able to actually understand what they’re saying. To not be exhausted after speaking with somebody for a while because I’m putting so much effort into trying to understand them, and still getting it wrong much of the time. To be able to speak with children again, and clearly hear their higher pitched voices. To hear just how many birds are really singing and chattering around me, and hear the fullness of the stream in my favorite park. To be able to hear my own voice again… I find myself singing around the house again because I no longer sound off key to myself. I discovered just last night that someone I’ve met in the last year has an accent; I’ve never heard it before because I was only hearing part of his voice. And while brushing my teeth is best done with my hearing aids out 😁, pretty much everything else is best done with them in. I also find I’m more aware of sound even when I’m not wearing them, I think because my brain has been ignoring what it could not interpret, and now is conscious of it again. Sound has been brought back more fully into my world, and I’m so enjoying getting used to it. If you think you have a hearing problem, get it checked out, because you may be missing more than you realize. This practice is a wonderful group of folks who take the time to explain it all, make sure it works for you, and help you get the best experience you can from your hearing aids.
Jay Resnick
Jay Resnick
2022-03-23
I recently got my second pair of hearing aids from Dr. Lish and the team at AHAC. I was so happy with my previous pair, until they started deteriorating. Dr. Lish cleaned and tested them, and informed me they were on their way out. I now have a new pair (of Phonak ones this time) and I could not be happier with how well they work. I am so grateful to Dr. Lish for her help and advice - and always seeing her smile (you can even see it through her very cool mask now). Delighted seems a fitting word for my experience with AHAC; I wouldn't consider going anywhere else for my hearing needs.
Dolores Martinchek
Dolores Martinchek
2022-03-22
I have been wearing hearing aids since I was 49 yrs old, am now 69 yrs old, and thrilled to be wearing the newest rechargeable battery hearing aids. No messing around with keeping batteries in my pocket or purse or needing to change them at the most inappropriate moment. Plug them in at night before going to sleep, unplug and place in my ears first thing in the morning, and done. At AHAC, my audiologist, Holly, is always up to date with the latest in hearing aid improvements. Holly takes the time to explain patiently how any of the devices work and wisely schedules check-up appts for the devices. AHAC is the best hearing aid center I have been with.
Martin C
Martin C
2022-02-15
After several pair of hearing aids and audiologists over the last 7 years, I finally found an audiologist who is fantastic! Dr. Maryann Nikander is a hearing impaired individuals dream! Starting from the initial hearing test, to the actual hearing aid determination, to the first fitting, EVERYTHING was accomplished in accordance with “best hearing practices.” I had a pair of custom ear pieces made by Dr. Nikander and they are perfect! No more annoying feedback noises or stuck domes in the ear canal! During the first fitting, she spent 2 hours with me fine tuning the hearing aids and explaining everything in detail! After two weeks, during my first post visit, we discussed what I liked and disliked about the aids and made adjustments. She even called the hearing aid manufacturer to ask about a question I had brought up! At every step in the process she thoroughly explained what she was doing and made sure that all my questions and concerns were addressed before I left. I never feel rushed and I am able to get every question answered. My hearing has never been better! I can actually hear sounds that just a few months ago I thought were gone forever! I watch the you tube channel and follow Dr. Cliff. He is a wealth of knowledge on hearing and hearing aids. Dr. Nikander was listed on his site as a qualified audiologist, with many years of experience who he determined follows Best practices. I highly recommend her when you require hearing and hearing aid expertise.
Cipollo SJ
Cipollo SJ
2022-02-07
Dr. Lish and the entire AHAC staff are the nicest, attentive and efficient people to work with. They listen, are professional and I would recommend AHAC to my family and friends. Dr. Lish meets you with a smile and is personable. Thank you for making my hearing improvement experience memorable.
Joe Donahue
Joe Donahue
2022-02-02
I was very fortunate to have my brother refer me to the Audiology and Hearing Aid Center in Warminster, PA and, in particular, Dr. Holli Lish. My brother called his hearing aids a "game changer" and how right he was. He told me that Dr. Lish would be most professional yet caring, helpful with the latest knowledge and offer me a simple way to understand the complex issues of adapting to hearing aids. Dr. Lish was all of that PLUS. When I had some initial problems adjusting the newly prescribed aids, she provided technical support in a very friendly manner. Dr. Lish has the most pleasing disposition in dealing with me because she comes across more as a 'friend with knowledge' than an overbearing 'know-it-all'. I would not hesitate to recommend Dr. Lish, or for that the whole staff at the Audiology and Hearing Aid Center in Warminster, PA, for any audiology needs.
Mike Seifried
Mike Seifried
2022-01-27
I found Audiology and Hearing Aid Center in Warminster in a directory of audiologists that follow best practices. Dr. Holli Lish did an excellent job of understanding my specific needs and selecting and fitting the hearing aids best suited to my situation. Hearing aids are a significant investment in quality of life, so it is important that they are programmed and fitted correctly. I feel confident that my hearing aids are working at their absolute best, and I am hearing things I haven't heard in years. Highly recommended!
Matthew Suchodolski
Matthew Suchodolski
2021-12-02
For years I struggled with a decreased level of hearing in parallel with an increased level of Tinnitus. As I look back, I now realize that I negated these occurrences; didn't want to admit it. It took a toll in regard to career performance and general life satisfaction. My mind was filling in the blanks and drawing inaccurate conclusions of what people were saying. Since being fitted up properly with hearing aids by Maryann at the Audiology and Hearing Center in 2019 my life has changed! I no longer fill in those blanks of what others are saying and my communication skills (both listening and speaking) have improved exponentially; especially in this day of age where communication is vital at both home and the office. The improved ability to hear really does support quality of life along with having a positive mindset. Maryann and her team at the Audiology and Hearing Aid Center are top notch professionals. For an end note, I have included the image below, because at age 55 vinyl records have never sounded better!

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