Starting June 23–July 11, our Outpatient Mental Health Clinic will pause new community applications to focus on our current waitlist. We will continue processing internal referrals. Also effective June 23, we will no longer accept Medicare Advantage plans—only Medicare Part B.

Leadership

Meet our Executive Leadership Team as well as our current Board of Directors.

Cornerstone Montgomery’s Executive Leadership Team exemplifies a balance of strategic vision, compassion, and a client-centered approach to mental health care.

CEO/President, Cari Guthrie’s transparent leadership fosters partnerships with public officials, while ensuring the organization’s mission remains focused on providing high-quality care.

Chief Administrative and Compliance Officer, Marisa Gillum safeguards operational excellence, ensuring adherence to compliance and legal standards while supporting organizational growth.

Chief Program Officer, Lisa Katz prioritizes evidence-based practices, enhancing program consistency and driving innovation to better serve clients.

Chief Medical Officer, Dr. Joy Chang leads clinical operations with a focus on redesigning healthcare systems, advancing the Certified Community Behavioral Health Clinic (CCBHC) program.

Chief Financial Officer, Stan Estremsky works with various departments to support operational and financial performance to assure Cornerstone has the funds to serve our clients.

Director of Human Resources, Liz Gatti is responsible for fostering a positive and inclusive workplace culture, focusing on workforce development and retention, ensuring staff are equipped to thrive while advancing the organization’s mission.

Development Officer and Marketing Communications Director, Quincy Inman builds strong partnerships and innovative fundraising strategies that strengthen revenue streams.

Together, they lead Cornerstone Montgomery with a shared commitment to improving the lives of the individuals and families they serve.

Cari A. Guthrie, LCSW-C

Chief Executive Officer & President

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Marisa S. Gillum

Marisa S. Gillum, MSW

Administrative Officer & Chief Compliance Officer

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Lisa H. Katz

Lisa H. Katz, LCPC

Chief Program Officer

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Joy Chang, MD

Chief Medical Officer

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Stan Estremsky

Stan Estremsky, CPA

Chief Financial Officer

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Elizabeth Gatti

Elizabeth Gatti, SHRM-CP

Director of Human Resources

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Quincy Inman

Quincy Inman

Development Officer & Director of Marketing Communications

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amanda-freeman

Ms. Amanda Freeman, Chair

St. Luke’s Episcopal Church

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Natasha Louis

Natasha Louis

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alice-santoro

Ms. Alice Santoro

Montgomery College

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Chambers-Joey

Mr. Joey Chambers

Capital Bank

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jennifer-jette

Ms. Jennifer Jette

Friedlander Misler, PLLC

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C Rauner 2

Ms. Cindy Rauner

Southern Maryland Electric Cooperative​

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John Wille

Mr. John Wille

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Kamelia Bayat

Kamelia Bayat

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Dan Helhowski

Dan Helhowski

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Leslie Kux

Leslie Kux

U.S. Food and Drug Administration (Retired)

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Clarissa Harris

Clarissa Harris

Director of Marketing, Events and Communications for the Greater Bethesda Chamber of Commerce

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