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John Cassidy, LADC

John Cassidy, LADC

Adult Substance Use Assessor

I believe that substance dependency is a treatable disease with treatment and support groups in the community. I’ve seen life-changing miracles take place in numerous substance dependent people and their families. I believe that treatment is an investment that benefits individual families and the community.

Clinic Locations

  • Stillwater Mental Health & Substance Use Disorder Clinic

Specialty Areas

  • Pre-Petition screening for substance use commitments in Washington County
  • Addiction, Alcohol Abuse, Court-Ordered Substance Use Treatment, Substance Use Disorders
  • Comprehensive Substance Use Assessments (Rule 25)
  • Fluent in Spanish

Professional Experience

John has worked in the field of Substance Dependency since 1973. He did his internship for the University of Minnesota and the University of Wisconsin at Human Services, Washington County in 1976. John has worked with Ramsey County Detoxification Center, Kinnic Falls Halfway House and Fairview Deaconess Adolescent Substance Dependency Treatment. He has been at Human Services of Washington County Substance Use Division since 1983.


  • Bachelor Degrees - University of Minnesota and St. John’s University, New York
  • Masters Degree in Counseling - University of Wisconsin-River Falls
  • Fellow of the Kellogg Foundation Partners of the America’s Program in International Development, 1992

License and Credentials

  • Licensed Alcohol and Drug Counselor, (LADC)

Referral & Information

To make a referral or appointment, please call our Intake Coordinators at (651) 777-5222; email, or complete this form to request an appointment.