Providing quality mental health care in the Peoria area since 1981


Quality mental health services.

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Bradford E. Colen, M.D.

Board Certified

Retired December 2019

Dr. Colen is a graduate of the Chicago Medical School and the University of Cincinnati Psychiatric Residency Program where he served as Chief Resident the last year. He continued there as an instructor for the next two years and started a Geropsychiatry Unit. Dr. Colen returned to his hometown of Peoria and began his private practice in 1981 as founder and President of Associates in Mental Health. He is a Clinical Associate Professor of Psychiatry at the University of Illinois College of Medicine in Peoria and was elected Distinguished Life Fellow of the American Psychiatric Association. Dr. Colen was elected President of the Medical Staff at Methodist Medical Center in 1992. He sees adolescents, adults and geriatric patients in individual, family, and group settings.

Karen M. Kyle, M.D.

Board Certified

Dr. Kyle is a graduate of Boston University School of Medicine. She completed her residency at Wilford Hall Medical Center, Lackland Air Force Base in San Antonio, Texas in 1989. She later served as Chief of the Mental Health Clinic with the 380th Medical Group at Plattsburgh AFB in New York. Dr. Kyle joined Associates in Mental Health in 1993. She sees adults and geriatric patients in an out-patient setting. Dr. Kyle specializes in anxiety and depressive disorders but sees individuals with a wide variety of problems including psychosis and dementia. Her practice style is such that she likes to spend time and talk with individuals so that she is aware of what issues need to be addressed whether they have a psychopharmacologic or a psychotherapeutic basis or both.

Matthew M. Preston, M.D.

Board Certified

Dr. Preston is a graduate of The Ohio State University College of Medicine, where he received the Henry A. and Amelia T. Nasrallah Psychiatry Excellence Award and was elected to the Gold Humanism Honor Society, which recognizes compassion, service to others, and integrity as well as clinical excellence. He continued his training at Ohio State for residency, and joined Associates in Mental Health in 2011. He enjoys that as a member of a private practice he has the freedom to spend more time with patients, and works in collaboration with his patients to meet their goals. He provides both medication management services and individual psychotherapy, with a particular interest in insight-oriented therapy, where the patient seeks to better understand themselves, their issues, and how to improve their quality of life.

Over 35 years experience

Providing quality mental health care


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Baljit Singh, M.D.

Board Certified

Dr. Singh was a resident at the University of Louisville School of Medicine where he also received the Golden Apple Appreciation Award for outstanding teaching. He has since worked as an attending psychiatrist with Methodist Medical Group and then as a Clinical Assistant Professor of Psychiatry at the University of IL College of Medicine at Peoria teaching medical students and residents about all areas of general adult psychiatry. Dr. Singh is a member of the American Psychiatric Association, has served as a board member for NAMI Tri-County and was president of the Central Chapter of the Illinois Psychiatric Society from 2005-2007. Dr. Singh joined Associates in Mental Health in 2015 where he treats patients age 18 and older for a wide range of mental illnesses. In addition, he volunteers his time to help educate the community in an effort to remove the stigma of mental illness and improve the quality of life for individuals and families struggling with mental health issues.


Andrew Wang, M.D.

Board Certified

Andrew Wang, MD joined Associates in Mental Health in 2018 and is a psychiatrist licensed in the State of Illinois. Dr. Wang received his bachelor's degree at the University of Toronto, St. George, and his medical degrees at Ross University School of Medicine. He completed his ACGME-accredited residency at University of Illinois College of Medicine Peoria, one of the few residencies in the country with heavy emphasis on different types of psychotherapies. Dr. Wang also served as the chief resident and received awards for academic excellence during his time at UICOMP. Dr. Wang specializes in working with adults and elderly with behavioral and mental health problems, such as depression, anxiety, trauma, bipolar disorder, ADHD, and other behavior disorders. His other interests include cognitive behavioral therapy and dialectical behavioral therapy. Dr. Wang has a variety of experience working in inpatient and outpatient settings. He has also given lectures at the medical school on schizophrenia and other related psychotic disorders.

Andrew Wang

Our psychiatrists