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.

Raymond G. Crookston Au.D., CCC-A

Ray is a second-generation audiologist with a passion for helping individuals with hearing loss. For over 20 years he’s been in private practice specializing in hearing diagonostics and hearing device technologies. He is certified and licensed with ASHA, CAA (California Academy of Audiology), and the State of California Audiology and Dispensing Bureau. Ray has taken his skills to remote parts of the world, attending audiology mission trips to Santo Domingo, Dominican Republic and Ghana, Africa.

Ray received his Doctor of Audiology degree from Central Michigan University – Mount Pleasant, MI. He also holds a Bachelor of Science degree in Communication Disorders from Utah State University in Logan, UT.

He loves the outdoors, and when he’s not spending time with his patients, he keeps busy running, hiking, and enjoying time with his family.

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. Having lived many years on Cape Cod – when she’s not out hiking, she enjoys spending time along the ocean.