Who We Are

Practice Philosophy


Our experience enables us to offer effective outpatient, individualized, psychological care. WPS is an inclusive practice that treats a number of mental health disorders through counseling, provides sport psychology & performance enhancement consulting by a sport psychologist, and conducts psychological testing by a licensed psychologist. 

Treatment Focus


Our focus is to help individuals heal, energize, and become aware of their inner strengths. We achieve this by providing a neutral safe space, listening to your concerns, and customizing a treatment plan. 

Client Promise


We promise to be there for you every step of your journey. Our goal is to help you grow from your struggles, heal from your pain, and move forward to where you want to be in your life. 


Counseling Services


We provide counseling services for individuals, couples, and groups in all developmental phases of life. We also provide EMDR.

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Psychological Testing


We offer psychological testing for children and adults who may have ADHD, learning disabilities, Autism Spectrum Disorder, and mood disorders.

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Sport & Performance Psychology


We use psychological knowledge and skills to address optimal performance and well-being of individuals and teams. 

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Ricki Walker, PhD, HSP, CMPC


Dr. Walker is a Licensed Psychologist, National Registered Health Service Psychologist (HSP), Certified Mental Performance Consultant (CMPC), and an adjunct professor for the University of Denver Graduate School of Professional Psychology. She is also the Sport Psychologist for the US Men's Alpine Ski Team. She previously was the Associate Director and Training Director for the University of Oklahoma Athletics Department Psychological Resources for OU Student-Athletes (PROS). 

Dr. Walker earned her Counseling Psychology Doctorate from the University of Northern Colorado, her Master’s degree in Sport and Performance Psychology from the University of Denver, and her Bachelor's degree from Colorado State University.  Dr. Walker has worked in clinical and athletic settings since 2006. Dr. Walker was a Division I Athlete, played semi-professional softball, and was drafted to play in the professional league following her collegiate career.

Her areas of clinical focus include psychological testing, sport and performance psychology, EMDR, pain management, worker compensation, LGBTQIA concerns, relational distress, anxiety disorders, and grief.

Colorado License Number: PSY. 0004283

Oklahoma License Number: 1238

Allie Don Sing, MA, LPCC


Allie is a Licensed Professional Counselor Candidate (LPCC) in the state of Colorado. In addition, Allie is in the process of acquiring her designation as a Certified Mental Performance Consultant (CMPC). She is supervised by Dr. Ricki Walker. Allie earned her Master’s degree in Sport and Performance Psychology from the University of Denver and her Bachelor’s degree from Auburn University. She has experience working in both clinical and athletic settings. 

Allie currently provides services in a clinical setting in the Denver area treating all forms of eating disorders. During her time at DU, Allie worked within the athletics department as a graduate assistant. She also provided sport psychology services to elite athletes in both individual and group settings. Allie completed specialized LGBTQIA+ training from the University of Denver becoming part of the Queer and Ally Network on DU’s campus.  

Her areas of clinical focus include sport and performance psychology, anxiety disorders, depression, women’s issues, relational distress, identity and self-concept development, and life transitions. No matter the area of focus, Allie takes a client-centered approach and views individuals in relation to their environments in her collaboration with clients.

Joey White, MA


Joey is a registered psychotherapist in the state of Colorado and is in the process of acquiring his designation as a Certified Mental Performance Consultant (CMPC). He holds a Master’s degree in Sport and Performance Psychology from the University of Denver. Joey receives supervision from Dr. Walker. Joey is also a member of the American Psychological Association’s Division 17, Counseling Psychology and 47, Sport and Performance Psychology. 

Before becoming a full time tennis coach and returning to school, Joey was a Division I athlete at the University of Iowa. Joey has provided sports psychology services to athletes in individual and group settings. Joey has experience working with athletes returning to sport after injury including traumatic brain injuries. Joey has almost two years of clinical experience working with refugees, LGBTQ+ individuals, child and adolescents, and individuals suffering from eating disorders. 

His areas of clinical focus include sport and performance psychology, anxiety disorders, depression, eating disorders, traumatic brain injuries, stress management, career counseling, and life transitions. 

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Walker Psychological Services, LLC

5684 South Prescott Street, Littleton, Colorado 80120, United States

phone: (720) 446-9438 fax: (720) 707-1632