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Timothy Stone, BA

Tim Stone has been part of the Cornerstone Team since 1999. He began his career assisting with the upkeep of the Recovery Residences that he now oversees. Tim’s responsibilities include ensuring that Cornerstone’s Recovery Residences are following the California DHCS, Joint Commission and CCAPP regulations at all times. Tim is also responsible for Cornerstones IT, …

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Simon A. Stone, BA

Samantha (likes to go by Sam) graduated from California State University, Fullerton with degrees in Psychology and Sociology.  She has been with Cornerstone since its conception in 1984.  She started in the Business office sending out insurance claims and collections.  After that she moved to Admissions and Intake.  She has spent most of her career …

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Samantha Stone, BA

Samantha graduated from California State University, Fullerton, with a BA in psychology and a BA in sociology. She has been with Cornerstone since its conception in 1984. Her main role at Cornerstone has been to coordinate all of our client admissions. If you need assistance in checking your insurance benefits or learning more about Cornerstone’s …

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Jessica Stone

Since Cornerstone’s inception, Jessica Stone has been an integral component of the family business. Co-founding it in 1984 with Michael, she has tirelessly dedicated her life to the improvement of recovery outcomes for thousands of addicts. Personal life: Born in India, she grew up in the UK where she met and married Dr. Stone in …

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Phil Kosanovich, MBA

Phil has a senior leadership profile that spans from entrepreneurial ventures to global corporations. His experience includes consulting, operational, and executive-level roles in the behavioral health and addiction treatment industries that include co-founding and growing two residential and outpatient treatment centers. Phil is an inclusive and transformational leader with a reputation for building strong client/patient-centered …

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Our former clients say it best...

Dr. Stone, I am so grateful to your program and also your generosity. I was a hopeless addict who believed there was no way of getting clean. Thanks to my sister and Cornerstone staff, I recently took my 90 day chip in N.A. Thanks, my life has been changed.
~ Isaac C.

“This was the best foundation I could have asked for to be sober. My case manager was the Best!! She showed me your life can be exciting and sober.”
~ Tina H.

It is the truly caring staff that makes Cornerstone the best rehab I have been to. The best part was finally getting my depression medications right, after many others tried for 2 years.
~ Jim V.

Licensed and Certified by the State of California Department of Healthcare Services.​

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