Nikki Theiss, LCPC

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Counseling Approach

Nikki most frequently meets with adults, college-aged young adults, and older teens. Nikki works with clients from a variety of backgrounds with a diverse range of needs and has special interest in providing counseling to LGBT + individuals, veterans, and first responders. It is important to Nikki that every client she meets with feels heard, understood, and respected.  Nikki interacts with clients with these core values in mind and strives to help them feel comfortable as they move through therapy. 

Nikki believes that every person, regardless of how they are feeling or functioning, has strengths that can be used and enhanced to solve the problems facing them.  One of her objectives is to empower individuals to identify and utilize these abilities to build skills and insights that will help them become more balanced, healthy, and happy.  Clients working with Nikki routinely find that by leveraging their innate strengths, they can adapt to situations, solve problems, and cope with difficulty much better and more quickly than if they ignored the foundation within themselves and tried to change everything about them and their lives.  


Nikki is a Licensed Clinical Professional Counselor (LCPC) in the State of Illinois. She obtained a Master’s degree in Professional Counseling from McKendree University, and a Bachelor’s degree in Psychology from Southern Illinois University Edwardsville. Currently, she works in private practice with individuals.

Nikki has past experience providing individual and group therapy in inpatient and outpatient
settings, as well as crisis intervention, and career management services. She has worked
with a variety of populations such as adolescents and adults, LGBTQ, veterans, and
individuals from a variety of cultural backgrounds. Nikki has successfully assisted individuals with many different and overlapping presenting concerns including addiction, anxiety disorders, depression, bipolar, domestic violence/abuse, grief, personality disorders, and schizophrenia.


Phone: 618-248-2040 x24


Location: Maryville


  • Teens (16-17)

  • Adults (18+)

Areas of Focus

Professional Experience

  • Individual, family, and group counseling in an agency and private-practice setting.

  • Career management services in an agency setting to individuals with moderate and severe mental illness.

Education and Credentials

  • L.C.P.C. in Illinois (What's This?)

  • M.A. in Professional Counseling from McKendree University

  • B.S. in Psychology from Southern Illinois University Edwardsville

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