Psychological Services
Psychological Services
Together We Shine
School psychologists partner with families, teachers, school administrators, and other professionals to create safe, healthy, and supportive learning environments that strengthen connections between home, school, and the community. They apply expertise in mental health, learning, and behavior to help children and youth succeed academically, socially, behaviorally, and emotionally. They are also important members of school safety and crisis teams.
We, the school psychologists at Derry Township School District, thank you our parents, community, staff and administration for the opportunity to work with such amazing students!
Thank you!
Dr. Lillenstein, Dr. Valle, Ms. Valentine, Ms. Wendell
DTSD School Psychs receive National Association of School Psychologists' Excellence in School Psychological Services Recognition
In January 2025, Derry Township’s school psychologists were nationally recognized for the second time with Proficient status in the NASP Excellence in School Psychological Services (ESPS) program—a mark of high-quality, comprehensive services. We focus on identifying student needs early and providing proactive supports to prevent challenges from growing. Using research-based strategies, we help students build academic skills, emotional resilience, and positive behaviors. By collaborating with families, teachers, and community partners, we create safe, inclusive environments where every child can thrive.
Why This Matters
Our goal is to empower students early—not just to address problems when they arise, but to build the skills, supports, and systems that prevent challenges from developing in the first place. We collaborate closely with teachers, administrators, and families to ensure that each student has what they need to grow and succeed.
We believe that every child can thrive when they have the right support—academically, socially, and emotionally. School psychologists in Derry Township are here to ensure that happens.
School Psychologists
Grades K-2
Sara Wendell, Ed.S, NCSP
School Psychologist
swendell@hershey.k12.pa.us
717-534-2501 x6035
Grades 3-5
Mike Valle, Ph.D., NCSP
School Psychologist
mvalle@hershey.k12.pa.us
717-534-2501 x 5136
Grades 6-8
Amanda B. Valentine, M.S., NCSP
School Psychologist
avalentine@hershey.k12.pa.us
717-534-2501 x6127
Grades 9-12, Gifted, Emotional Support
Dr. David J. Lillenstein, NCSP
School Psychologist
dlillenstein@hershey.k12.pa.us
717-534-2501 x5436
30 E. Granada Avenue
PO Box 898
Hershey, PA 17033
Masters/Doctoral Level Interns:
Camden Boris, M.Ed.
Indiana University of PA
Madeline Marsh, M.Ed.
Indiana University of PA
Caitlyn Pike, M.Ed.
Indiana University of PA