Mary von Witzleben, PhD, BCBA-D (ZDP Associates)

Mary von Witzleben, phd Silver Lake Elementary School Middletown, DE
Louis L Redding Middle School Middletown, DE
Middletown High School Middletown, DE
BA Hood College (Psychology)
MA, Ed.S, Ph.D. University of South Florida (School Psychology)
BCBA-D University of North Texas (Doctoral level Board Certified Behavior Analyst)

Mary von Witzleben, Ph.D., BCBA-D is a licensed psychologist in DC, Virginia, Louisiana, and Hawaii. She is also a Board Certified Behavior Analyst, with a functional command of Spanish.  She has extensive training and experience administering psycho-educational assessments and in using the ADOS and ADI-R to identify educational, social, and behavioral needs. Mary specializes in working with individuals with developmental and intellectual disabilities, their families, and support systems to design behavioral programs that increase independence and enhance accessibility to community supports.

Her career spans over two decades and has afforded her the opportunity to become proficient in assessments, behavioral intervention development, training, staff development, supervision, teaching, and designing and overseeing system wide initiatives and programs. Early in her career, she focused on individuals with Emotional Disabilities.  After earning her BCBA, she expanded the scope of her practice to include children and adults with Intellectual and Developmental Disabilities. She has worked as a school psychologist and special education administrator for school-wide Autism programs spanning pre-school to high school.  She is a Nationally Certified School Psychologist and certified by the National Register of Health Service Psychologists.

Mary is a military spouse, and has lived and worked across the USA and overseas. These frequent moves increased her adaptability, flexibility, and sensitivity to cultural, economic, and language differences. She is excited to use her experiences and worldwide perspective to address your family’s scholastic and behavioral needs.

When away from work, Mary enjoys running, traveling, and spending time with her family.



we are available to come to your school or business

office hours

individual psychologist's hours vary & appointments are always required


8:00 am-5:00 pm


8:00 am-5:00 pm


8:00 am-5:00 pm


8:00 am-5:00 pm


8:00 am-5:00 pm





feel free to contact us!