Psychologist | Clinical Psychology

Dr. Gregory Tierney, PHD

920 S Prairie Dr, Suite F, Sycamore, Illinois, 60178

About Dr. Gregory Tierney

Dr. Gregory Tierney is a psychologist based in Sycamore, Illinois who is specialized in Clinical Psychology. Active license number of Dr. Gregory Tierney is 071.006674 for Clinical Psychology in Illinois. His current practice location is 920 S Prairie Dr, Suite F, Sycamore. Patients can contact him at 815-899-0339 or can fax him at 815-899-2098. Dr. Gregory Tierney, PHD, specializes in Clinical Psychology and his NPI number (Unique professional ID assigned by NPPES) is 1609949809.

Dr. Gregory Tierney is a mental health professional with highly specialized training in the diagnosis and psychological treatment of mental, behavioral and emotional illnesses, including obsessive-compulsive disorder (OCD). His main focus is on diagnosing and treating mental, emotional, and behavioral disorders. Some of the common disorders that he can treat are learning disabilities, substance abuse, depression, anxiety, and eating disorders.

Practice Information

Dr. Gregory Tierney'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. Gregory Tierney
Specialization Clinical Psychology
Credentials PHD
Gender Male
Practice Address: 920 S Prairie Dr, Suite F
Sycamore, IL - 60178
Fax 815-899-2098

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 Number1609949809
NPI Enumeration Date: 16 Nov, 2006
NPI Last Update On: 23 May, 2018

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. Gregory Tierney are as mentioned below.

License NumberSpecializationStateStatus
071.006674Clinical Psychology IllinoisPrimary

Mailing Address

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

Dr. Gregory Tierney
3498 Sanborn Ln,
Dekalb, IL - 60115-8304
Phone: 815-758-3627

Book an Appointment with Dr. Gregory Tierney

To schedule an appointment, contact Dr. Gregory Tierney at 920 S Prairie Dr, Suite F, Sycamore, Illinois or call the phone number listed below.

Book an Appointment

Frequently Asked Questions

Below are some commonly asked questions about Dr. Gregory Tierney:

Dr. Gregory Tierney is a psychologist specializing in Clinical Psychology. He is a mental health professional with highly specialized training in the diagnosis and psychological treatment of mental, behavioral and emotional illnesses, including obsessive-compulsive disorder (OCD). His main focus is on diagnosing and treating mental, emotional, and behavioral disorders. Some of the common disorders that he can treat are learning disabilities, substance abuse, depression, anxiety, and eating disorders.

Yes, Dr. Gregory Tierney 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. Gregory Tierney practices at 920 S Prairie Dr, Suite F, Sycamore, Illinois, 60178.

To schedule an appointment with Dr. Gregory Tierney, please contact the office at 815-899-0339.

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