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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Jennette Von Bargen, Psy.D.

Dr. Jennette von Bargen is a licensed psychologist. She holds a doctorate in Clinical Psychology from Widener University. She also obtained a masters degree in Clinical Psychology at Widener University.
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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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Gina Simon, LPCMH.

Gina Simon is a Licensed Professional Counselor of Mental Health. She holds a Bachelor of Science Degree in Elementary and Special Education from the University of Maryland. She is also a National Certified Counselor. She spent twenty years teaching primary grades; including special needs children in an inclusion setting.
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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