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Dr. Sibyl Cornell Hewitt, PhD, LP

Dr. Sibyl Cornell Hewitt, PhD, LP

Psychologist
777 29th St, Boulder, CO
Sibyl Hewitt helps patients across Colorado navigate emotional challenges with compassionate, evidence based care that supports meaningful change. She works with children, adolescents, teens, and adults, offering a grounded therapeutic presence for individuals seeking support with concerns such as anxiety, depression, ADHD, and trauma. As part of her work at LifeStance Health, she is committed to creating a space where patients feel understood, respected, and empowered to move toward healthier patterns in their daily lives. Her clinical approach is shaped by a deep dedication to helping young people and families address childhood behavior issues, school avoidance, and developmental or neurodivergent needs. She is especially passionate about supporting individuals with autism spectrum disorders and developmental disabilities, helping them build emotional regulation skills, strengthen communication, and navigate life transitions with greater confidence. Sibyl also provides psychological testing and neuropsychological evaluations to clarify diagnoses and guide treatment planning for patients across the lifespan. Sibyl integrates Cognitive Behavioral Therapy, Dialectical Behavior Therapy, EMDR, and Exposure based interventions, tailoring each treatment plan to the unique needs of the patient. She frequently incorporates CBT for Insomnia, parenting skills work, and trauma focused strategies to support individuals coping with PTSD, grief, or long standing patterns that interfere with daily functioning. While she focuses on several core specialties, she also offers additional services to meet a wide range of mental health needs within the Colorado community.

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Scheduling details

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Available appointments

Tomorrow, Jun 13 – Fri, Jun 26
View more availability

About Dr. Sibyl Cornell Hewitt

Focus areas

Anxiety
Bipolar Disorder
Obsessive Compulsive Disorder (OCD)
Attention-Deficit / Hyperactivity Disorder (ADHD)
Childhood Trauma
Schizophrenia
Bereavement / Grief Counseling
Depression

Clientele seen

Children (<13)
Adults (25-64)
Teenagers (13-17)
Individuals
Young adults (18-24)
Families

Treatment approaches

Cognitive Behavioral (CBT)
Exposure Response Prevention
Dialectical (DBT)
Parent-Child Interaction (PCIT)
EMDR
Trauma Focused

Identity

Gender

Female

Languages spoken

English

Getting to know Dr. Sibyl Cornell Hewitt

Sibyl Hewitt helps patients across Colorado navigate emotional challenges with compassionate, evidence based care that supports meaningful change. She works with children, adolescents, teens, and adults, offering a grounded therapeutic presence for individuals seeking support with concerns such as anxiety, depression, ADHD, and trauma. As part of her work at LifeStance Health, she is committed to creating a space where patients feel understood, respected, and empowered to move toward healthier patterns in their daily lives. Her clinical approach is shaped by a deep dedication to helping young people and families address childhood behavior issues, school avoidance, and developmental or neurodivergent needs. She is especially passionate about supporting individuals with autism spectrum disorders and developmental disabilities, helping them build emotional regulation skills, strengthen communication, and navigate life transitions with greater confidence. Sibyl also provides psychological testing and neuropsychological evaluations to clarify diagnoses and guide treatment planning for patients across the lifespan. Sibyl integrates Cognitive Behavioral Therapy, Dialectical Behavior Therapy, EMDR, and Exposure based interventions, tailoring each treatment plan to the unique needs of the patient. She frequently incorporates CBT for Insomnia, parenting skills work, and trauma focused strategies to support individuals coping with PTSD, grief, or long standing patterns that interfere with daily functioning. While she focuses on several core specialties, she also offers additional services to meet a wide range of mental health needs within the Colorado community.

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In-network insurances

Aetna
BlueCross BlueShield
Cigna
Medicare
UnitedHealthcare
200+ more in-network plans

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It’s common for mental health providers to be out-of-network. Many insurance plans offer out-of-network coverage, so you may get partially reimbursed. Learn more

Popular visit reasons

Anxiety Disorder
Depression
New Patient Visit
Pediatric Tics / Tourette Syndrome
Psychotherapy
Psychotherapy Intake / Initial Visit
Sleep Problems
Young Adult Issues
Anxiety Disorder
Depression
New Patient Visit
Pediatric Tics / Tourette Syndrome

Office location

Dr. Sibyl Cornell Hewitt, PhD, LP also offers online video visits for patients
LifeStance Health - Colorado- 2
777 29th St, Boulder, CO 80303
Get directions

Education and background

Practice names

Education and training

  • University of Northern Colorado, PhD in Psychology

NPI number

1831738863

Patient reviews

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Frequently asked questions

How soon can I make an appointment with Dr. Sibyl Cornell Hewitt?

Generally, Dr. Sibyl Cornell Hewitt has appointments available on Zocdoc within 1 week. You can see Dr. Hewitt's earliest availability on Zocdoc and make an appointment online.

Is Dr. Sibyl Cornell Hewitt accepting new patients?

Dr. Sibyl Cornell Hewitt generally accepts new patients on Zocdoc. You can see Dr. Hewitt's earliest availability on Zocdoc and schedule an appointment online.

Does Dr. Sibyl Cornell Hewitt accept my insurance?

Choose your insurance plan to verify if Dr. Hewitt is in-network.

Can I make an appointment with Dr. Sibyl Cornell Hewitt online?

Yes, you can make an appointment online with Dr. Hewitt using Zocdoc. It’s simple, secure, and free.

What practice does Dr. Sibyl Cornell Hewitt work with?

Where is Dr. Sibyl Cornell Hewitt's office located?

Dr. Sibyl Cornell Hewitt has 2 office locations in Boulder, view full addresses on Dr. Hewitt's profile.

What are common reasons for patients to see Dr. Sibyl Cornell Hewitt?

Dr. Sibyl Cornell Hewitt frequently sees patients for Depression, New Patient Visit, Psychotherapy, Psychotherapy Intake / Initial Visit, and Sleep Problems. You can see other visit reasons for Dr. Sibyl Cornell Hewitt on their profile.

What languages does Dr. Sibyl Cornell Hewitt speak?

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