Psychologist | Clinical Child & Adolescent Psychology

Dr. Douglas Lon William, PH.D.

30 Flower Ln, Jericho, New York, 11753-2312

About Dr. Douglas Lon William

Dr. Douglas Lon William is a psychologist based in Jericho, New York who is specialized in Clinical Child & Adolescent Psychology. Active license number of Dr. Douglas Lon William is 6159 for Clinical Child & Adolescent Psychology in New York. His current practice location is 30 Flower Ln, Jericho. Patients can contact him at 516-931-0752. Dr. Douglas Lon William, PH.D., specializes in Clinical Child & Adolescent Psychology and his NPI number (Unique professional ID assigned by NPPES) is 1871632489.

Dr. Douglas Lon William analyse the cognitive, social and emotional development of children. Typically, he look at development from the prenatal period through adolescence. Some of the traditional areas of interest include genetics, language development, learning disabilities, personality, gender roles, cognitive development, sexual development and social growth.
Clinical Child Psychologist responsibilities includes task like assessing and treating learning or developmental disabilities or delays; Working with children and their caregivers to manage behavioral issues; Administering psychological tests; Conducting scientific research on childhood development; Working with a health care team to create a unique treatment plan for a client.

Practice Information

Dr. Douglas Lon William's specialty, credentials, practice address, contact phone number and fax are as below. Patients can call on the below given phone number for appointment.

Provider Name Dr. Douglas Lon William
Specialization Clinical Child & Adolescent Psychology
Credentials PH.D.
Gender Male
Practice Address: 30 Flower Ln,
Jericho, NY - 11753-2312

Professional Identification Codes

NPI number stands for National Provider Identifier which is a unique 10-digit identification number issued to healthcare providers in the United States by the Centers for Medicare and Medicaid Services (CMS). NPI details are as mentioned below.

NPI Number1871632489
NPI Enumeration Date: 06 Feb, 2007
NPI Last Update On: 08 Jul, 2007

Medical Licenses:

Healthcare professionals can hold one or more medical licenses for different specialties in the same state or different states. Related medical licenses for Dr. Douglas Lon William are as mentioned below.

License NumberSpecializationStateStatus
6159Clinical Child & Adolescent Psychology New YorkPrimary

Mailing Address

Business mailing address can be used for mailing purpose only, for visiting purpose patients need to refer above mentioned Practice address.

Dr. Douglas Lon William
30 Flower Ln,
Jericho, NY - 11753-2312
Phone: 516-931-0752

Book an Appointment with Dr. Douglas Lon William

To schedule an appointment, contact Dr. Douglas Lon William at 30 Flower Ln, Jericho, New York or call the phone number listed below.

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Frequently Asked Questions

Below are some commonly asked questions about Dr. Douglas Lon William:

Dr. Douglas Lon William is a psychologist specializing in Clinical Child & Adolescent Psychology. He analyse the cognitive, social and emotional development of children. Typically, he look at development from the prenatal period through adolescence. Some of the traditional areas of interest include genetics, language development, learning disabilities, personality, gender roles, cognitive development, sexual development and social growth.
Clinical Child Psychologist responsibilities includes task like assessing and treating learning or developmental disabilities or delays; Working with children and their caregivers to manage behavioral issues; Administering psychological tests; Conducting scientific research on childhood development; Working with a health care team to create a unique treatment plan for a client.

Yes, Dr. Douglas Lon William is currently accepting new patients. To schedule an appointment, contact the office directly and schedule an appointment.
*Availability may change. Please contact the office directly to ask about appointments.

Dr. Douglas Lon William practices at 30 Flower Ln, Jericho, New York, 11753-2312.

To schedule an appointment with Dr. Douglas Lon William, please contact the office at 516-931-0752.

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**Data of this site is collected from Medicare & Medicaid Services (CMS) and NPPES. Last updated on 14 September, 2026.