Cornerstone of Southern California, Celebrating 40 Years
Phil Kosanovich, MBA
President & Chief Executive Officer

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 teams focused on clinical excellence. He has an extensive record of success in leading companies through transitional periods of growth and creating and maintaining strong external partner relationships.

Phil’s expanded healthcare industry experience was with Landauer, where he started two subsidiary companies and led company operations in Australia and China. Prior to his 30 years in the healthcare industries, Phil was president of human resource and financial services related subsidiaries of Travelers, Equitable, Lincoln Financial Group, and Chicago Title & Trust. He has served on the executive board and in multiple leadership roles of a global human resources trade organization and elected into that industry groups Hall of Leaders. Phil has served on the boards of several healthcare-related charities and is the Chair of the Community Relations Commission in his hometown. Phil earned an MBA from DePaul University and a Bachelor of Science in Business Administration from Valparaiso University. He is in long term recovery.

Author’s publications

The Growing Danger of Fentanyl with Xylazine & Treatment Options

By Phil Kosanovich on October 25, 2023
Fentanyl and Xylazine: The Increasing Dangers and Treatment Options In the last 10 years, the dangers of Fentanyl exposure have become increasingly more wide spread, including and especially across public platforms and social media. And though both healthcare professionals and government establishments, including the U.S. Department of Justice Drug Enforcement Administration (DEA), the Federal Drug […]
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Celebrating National Recovery Month: Together We are Stronger

By Phil Kosanovich on September 18, 2023
Celebrating National Recovery Month This September Addiction is a disease that not only affects the individual, but their entire network – family, friends, community, and beyond. While consistently misunderstood and stigmatized, it’s vital for individuals and community members to have a platform that both celebrates and encourages new recovery and sobriety practices, giving them the […]
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Mental Health Awareness Month: Supporting Diverse Communities

By Phil Kosanovich, MBA on April 22, 2024
This May Mental Health Awareness Month shines a spotlight on critical areas of mental health in America. Established in 1949, this annual observance is focused on advocating for supporting people with mental health conditions and encouraging a broader understanding of the role that mental health plays in overall well-being. Cornerstone of Southern California is dedicated […]
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How Long Do Amphetamines or Speed Stay in Your System?

By Phil Kosanovich, MBA on March 21, 2024
Amphetamines or Speed can be detected in urine for up to four days, in blood up to 48 hours, in saliva for around 60 hours, and in hair follicles for up to 90 days after use. Amphetamine detectability depends on many factors, including the type of drug test, frequency of drug use, amount of drug […]
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How Long Does Crack Stay In Your System?

By Phil Kosanovich, MBA on March 21, 2024
Generally, urine, saliva, or blood tests show the presence of crack cocaine for just a few hours or days, while hair drug tests for crack can show the presence of cocaine for months or even years. Crack will stay in your system for longer with heavy and prolonged use. More info about the different drug […]
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How Long Does Klonopin Stay in your System?

By Phil Kosanovich, MBA on January 12, 2024
Klonopin’s detectability in drug tests varies, ranging from 1 to 30 days after the last use. This length of detectability differs based on the individual and the type of drug test. Urine drug tests can detect Klonopin for two to four weeks after the last dose, saliva tests for five to six days, hair tests […]
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