Welcome to Appel Wilson & Vaughn

*Our Lewes Location is now open!!

Appel, Wilson & Vaughn is a psychology group that provides psychological therapy and counseling services. Located in Lewes and Dover, Delaware, Appel, Wilson & Vaughn serves the lower Delaware area, including Dover, Smyrna, Milford, Lewes, Rehoboth, and both Kent and Sussex Counties. Appel, Wilson & Vaughn provides a variety of services, including therapy/counseling, psychological testing, psychological evaluations, consulting, and forensic services to a variety of ages.
With its helpful staff, experienced psychologists, and peaceful setting, Appel, Wilson & Vaughn is well suited to meet your psychological and counseling needs.

Meet our Psychologists

Peter Appel, Ph.D.

Edward Wilson, Ph.D.

Dr. Ted Wilson is a licensed psychologist. He holds a doctorate from Duke University (1979), master degree from Duke University
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Mary Vaughn, Psy.D.

Dr. Mary Vaughn is a licensed psychologist. She holds a doctorate in Clinical Psychology from La Salle University.

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Edwin Oliver, Psy.D.

Edwin Oliver is the Head of Related Services at Baltimore Lab School (BLS).He also oversees the assessments and student progress at the Dyslexia
Tutoring Program. Eddie has been a Clinical Psychologist at BLS since 2002.

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Dani Parsell, Psy.D.

Dr. Dani Parsell is a Psychological Assistant and Certified School Psychologist. She earned her Doctoral Degree in Clinical Psychology with a concentration in Cross-Cultural Psychology from Widener University.
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Outpatient Therapy

Outpatient Therapy
Appel, Wilson & Vaughn provides outpatient therapy and counseling services to children, adults, couples, and families …Read More


Appel, Wilson & Vaughn provide psychological testing for a variety of difficulties, including Attention …Read More


Consultation services are offered in the following areas: …Read More

Forensic/Legal Services

Appel, Wilson & Vaughn provides forensic services that include Parent Coordination, psychological evaluations, bonding …Read More