It’s so easy when I can find everything I need for better hearing is in one place.


No one should settle for second best when it come to hearing. Our expertise, combined with years of experience, ensures that you get the individual care, evaluation and dialogue necessary for your long-term hearing health. Although no two people or solutions are the same, we have only one standard – that’s raising the quality of your life.


we’re here to serve

Christine S. Mahon, M.A., F-AAA – Clinical Audiologist

Christine received her B.A. in Speech Pathology/Audiology and her Master of Arts in Audiology from San Jose State University. She is licensed by the State of California as a Dispensing Audiologist.

Prior to opening Diablo Hearing Services, Christine worked as a clinical audiologist within the Kaiser Clinics in the Bay Area and for three private audiology/hearing aid dispensing practices in the East Bay area. She also worked as a contract audiologist for Synergy Rehabilitation, providing hearing testing for numerous skilled nursing facilities in the local Bay Area and in Central California.

Christine has a passion for people and helping them to better understand and discover solutions to their communication issues. In her moments of leisure, she spends time with family, friends, and staying active outdoors.

Janelle Spear, AU.D., Doctor of Audiology

Janelle Spear has over 30 years of experience practicing audiology in the Bay Area.Since her initial clinical fellowship training at UCSF, she has worked in both public and private practice settings, and has experience with manufacturer training and research.Her areas of special interest are in adult aural rehabilitation and tinnitus, and she is certified by the Tinnitus Practitioners Association.She is most passionate about helping clients reduce the stress of listening by combining the latest high-tech solutions with interpersonal communication strategies. She earned her BS from the University of Oregon; her Master’s degree from UC Santa Barbara, and her AuD from AT Still University. Outside of work she is an avid mountain biker and pianist, and enjoys hiking in the Oakland hills with her family (including her 100-pound labrador mix).

Kristy Millert, Patient Care Coordinator

Kristy joined the Diablo Hearing Services team in 2017. She has more than 10 years of administrative experience and loves helping people. She is quick to greet patients with a smile in person or on the phone and will always take care of you with a can-do attitude. Kristy has two children that keep her very busy with sports and activities. She and her family love spending time at the beach and attending baseball games.


Ann joined us at Diablo Hearing Services in 2018 and bring s a wealth of experience with her 10 years of office management. On top of her skills, Ann is a great people person with her outgoing personality and sense of humor. Best of all, she loves helping patients!

For over 20 years, Ann keeps her busy life in balance though practicing yoga. She keeps active by hiking, taking long brisk walks, and loves spending time with her family – especially her new grandson 🙂 Having lived many years on Cape Cod – when she’s not out hiking, she enjoys spending time along the ocean.

Gabi Orozco, Patient Care Coordinator

Gabi joined the Diablo Hearing Services team in 2021. She first started learning ASL (American Sign Language) in high school, which is when she began to discover her interest in audiology. She took ASL classes throughout her high school years and continued to do so through college. Gabi graduated from Sacramento State University in the Spring of 2021 with a B.S. in Communication Sciences and Disorders and with a Minor in ASL/Deaf Studies.

She is now interested in getting her Hearing Aid Dispensing License for California and is considering graduate school to earn an Au.D. degree.