Sean Warner, MS, LAC. Sean Warner is a Licensed Addiction Counselor in the State of Colorado. He has worked in the substance use disorder field for over ten years, with experience in withdrawal management, outpatient treatment, and inpatient treatment. He earned his bachelor’s degree in psychology from Argosy University and his master’s degree in addiction counseling from Grand Canyon University. Sean uses a person-centered approach that also incorporates motivational interviewing, CBT, DBT and REBT modalities. He is also a proud veteran of the United States Navy.