ADI Staff

Denise O'Sullivan

Denise O'SullivanCADTP
Director, Clinical Supervisor
Bachelor of Science, Cal Poly SLO

Denise grew up in Santa Cruz and earned a BS from Cal Poly in San Luis Obispo. She has been with ADI since 1991 as both a counselor and administrator experienced with DUI, Drug Diversion, Domestic Violence and Outpatient Treatment. She describes her ADI experience as follows: "My position is a blend of interacting with the clients and coordinating our compassionate and talented staff. No two days are ever alike; I am most grateful for the chance to guide our clients through the DUI process, and witness many life altering behavior changes as people progress through our program. The smiles, the thanks and the positive feedback upon program completion is awesome to witness! The addition of our new Outpatient Treatment Program and Anger Management Program will allow us to provide much requested additional services to the local community."



Melissa Shawhan

Melissa ShawhanAdministration
Melissa has been working at ADI since 2007 as an administrative manager. She is currently working towards a BA in addictive disorders. Melissa enjoys working with the large spectrum of clients enrolled here. She feels it is very rewarding to know that ADI offers a service that so many participants find helpful.

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Carol Dyer

Carol DyerAdministrative Analyst
Carol has been working at ADI since 1978. Before that she worked at Intel for 16 years. When asked what she likes about working at ADI she responded, “everything!” In her free time she likes to spend time with her family, enjoys going to Capitola, and is a big fan of the Little River Band.

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Melinda Myrick







Ed Sentner

Outpatient Services Director

Ed has been an alcohol/drug counselor since 1989, His credentials include state, national and international certification as an alcohol/drug counselor, and certification in relapse prevention therapy. He received a BA History, from UCSC 1992, and a Certificate in Alcohol and Drug Studies from UCSC in 1995.
Ed started his counseling career as a volunteer at Janus Detox in 1989. In 1993 he started DUI counseling. Since then he has worked in many different counseling settings, including being the clinical advisor for a residential treatment center in India.
Ed came to ADI in 2005. He currently teaches education classes, does assessments for first offenders, facilitates a first offender group, and is ADI’s Outpatient Services Director. Ed likes Working for ADI because DUI counseling offers a chance to work with people who are often headed for addiction but may not yet be there yet. He is also very excited about working in ADI’s new outpatient program. Whenever he can, Ed sneaks off to India to help out at the treatment center there and absorb the culture and cuisine of South Asia.
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All ADI Staff