Our Newark Team

Delaware Psychological Services is committed to serving the behavioral health needs of Children, Families

and Individuals. We take a multidisciplinary approach in our work with clients. Our team of experienced professionals come from the fields of psychiatry, social work, psychology, mental health and addictions counseling and work together to ensure client care is individually tailored to your unique needs.

Lisa Ritchie


Mattie L. Costill


Shaniqua Johnson-Pierce


Mattie is a Licensed Professional Counselor of Mental Health working with Delaware Psychological Services. I've been working in the field for 10 years and have experience with both inpatient and outpatient settings as well as school-based therapy.

I work mostly with individuals and families with experience in couples counseling, co-parenting, reunification therapy, depression, anxiety, trauma and grief along with extensive experience working with students with Special Education and mental health needs.

I utilize a holistic approach along with Cognitive Behavior Therapy and Mindfulness to get to know each of my clients as an individual so we can best figure out what will be helpful for you to start feeling better.

DeAnna Lunn


Deanna Lunn is an APRN-CNP, credentialed by the American Academy of Nurse Practitioners as a Family Nurse Practitioner. Deanna has worked primarily in Sub-Acute, Acute and Correctional environments. She has been a nurse for 3 decades. Deanna completed her Bachelor of Science in Nursing at Delaware State University and her Master of Science in Nursing at Wilmington University. Deanna is currently enrolled in the Post Master’s Psychiatric Mental Health Nurse Practitioner program at Wilmington University. She practices with a holistic approach to mental, physical, and spiritual health and advocates good nutrition, exercise and stress management to attain health goals. Interests include photography, yoga, music, running and travel. She is family oriented, often enjoying laughing with her 3 teenage children, spending time with her parents, friends and dogs.

Lisa is a Licensed Professional Mental Health Counselor and a Licensed Chemical Dependency professional with 25 years of experience.  She has worked in many different levels of care including Inpatient, partial hospitalization, intensive out patient and outpatient.  Lisa utilizes motivational interviewing to assist clients in clarifying and then achieving their treatment goals. Lisa is passionate about treating process addictions and has success in helping people achieve balance in their lives again.  For those that are interested, meditation techniques can be included to assist with the management of various symptoms.  Lisa works with clients in a holistic way, encouraging and supporting clients in achieving their personal goals.  

Julia Zambelli


Julia is a Licensed Associate Counselor of Mental Health working her way towards her professional licensure. She has earned two master's degrees in Counseling and Mental Health Services from the University of Pennsylvania in 2017. Further, Julia has worked primarily in school-based therapeutic settings and has experience working with children, adolescents, and their families. Additionally, she has extensive experience working with students with Special Education and mental health needs in the academic setting. She is passionate about providing counseling services to children & adolescents, adults, couples, and families who may be struggling in areas such as grief, trauma, depression, and anxiety. Julia utilizes a holistic approach as well as person-centered therapy and motivational interviewing in order to support individuals in their capacity and desire for personal growth and change. She enjoys spending time with family and friends and her hobbies include gardening, cooking, crafting, and exercising.

Shaniqua Johnson-Pierce, LCSW is originally from Harlem, New York and takes a great interest in utilizing the performing arts to support healing complex trauma. Shaniqua earned a Master of Social Work degree from Temple University with a clinical specialization in working with children and families in 2012. In addition, Shaniqua also serves as an adjunct professor for Widener University’s Graduate Social Work department teaching family therapy and serving as the field liaison for students completing their clinical field practicums. Shaniqua is an energizing and passionate therapist (LCSW) whom enjoys providing counseling services to adults, children, couples, and families who struggle with grief, trauma, depression, anxiety, and firmly believes that people are capable of healing in various avenues of their lives. She has an extensive background in working with children and families in several different settings such as outpatient substance abuse programs, inner city school settings in Philadelphia and Delaware and an HIV clinic. Shaniqua takes a holistic approach to treatment that focuses on mindfulness, trauma informed care, and narrative therapy.

Bradley Owens


Bradley Owens has spent the last ten years immersed in the criminal justice system, assisting thousands of men and women with navigating the courts, the prisons, and post-incarceration. Since graduating from law school in 2015, Brad has focused his work on reentry planning services, cognitive behavioral treatment, and other behavioral health care services—especially for justice-involved individuals who suffer from mental health and substance abuse disorders. Other areas of expertise include staff training and development, grant writing, public speaking, and social entrepreneurship. Brad is a Delaware native who grew up in Lewes and currently lives in Wilmington. He enjoys spending his time with his daughter, Alivia, his partner, Angela, and their dog, Bowie. 

16287 Willow Creek Road

Lewes, DE 19958

262 Chapman Road, Bellevue Building, Suite 100, Newark, DE 19702

Call Us: 302-703-6332

Fax: 302-827-4856

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