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    • Home
    • Providers
    • Services
      • Medication Management
      • Psychotherapy
    • TMS Therapy
      • About TMS Therapy
      • TMS Therapy Waitlist
    • Patient Payments
  • Home
  • Providers
  • Services
    • Medication Management
    • Psychotherapy
  • TMS Therapy
    • About TMS Therapy
    • TMS Therapy Waitlist
  • Patient Payments

Our Providers

 

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Kevin Wethey, M.D.

Dr. Wethey is  a board-certified psychiatrist and founder of Mentality Behavioral Health Center in Diamond Bar, California. He earned his medical degree from St. George’s University and completed his psychiatric residency at Kaiser Permanente, Fontana. Dr. Wethey also serves as Medical Director at Canyon Ridge Hospital in Chino.

 

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Gerald Goco, PMHNP

Paul Arredondo, PMHNP

Gerald is accepting new patients.


Gerald is a board-certified Psychiatric Mental Health Nurse Practitioner providing compassionate, personalized care in a safe, judgment-free space. He treats anxiety, depression, ADHD, and mood disorders in adolescents and adults, using a collaborative, trauma-informed, culturally responsive approach. He i

Gerald is accepting new patients.


Gerald is a board-certified Psychiatric Mental Health Nurse Practitioner providing compassionate, personalized care in a safe, judgment-free space. He treats anxiety, depression, ADHD, and mood disorders in adolescents and adults, using a collaborative, trauma-informed, culturally responsive approach. He integrates medication management with supportive psychotherapy and offer in-person and telehealth visits to ensure accessible, empowering, and individualized care.

Check Gerald's Availability
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Nancy Rehfeld, PMHNP

Paul Arredondo, PMHNP

Paul Arredondo, PMHNP

Nancy is a board certified, mental health nurse practitioner

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Paul Arredondo, PMHNP

Paul Arredondo, PMHNP

Paul Arredondo, PMHNP

Paul is accepting new patients.


Paul is a board certified, mental health nurse practitioner. 

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Shana Garcia, PsyD

Shana Garcia, PsyD

Shana Garcia, PsyD

Dr. Garcia is a Licensed Clinical Psychologist and provides virtual psychotherapy. Areas

of expertise include mood and anxiety disorders, interpersonal and self-esteem

challenges, gender dysphoria, life transitions, family dysfunction, disordered eating,

grief, and trauma. She cultivates mutual trust and encourages active participation

toward

Dr. Garcia is a Licensed Clinical Psychologist and provides virtual psychotherapy. Areas

of expertise include mood and anxiety disorders, interpersonal and self-esteem

challenges, gender dysphoria, life transitions, family dysfunction, disordered eating,

grief, and trauma. She cultivates mutual trust and encourages active participation

toward self-actualization. Dr. Garcia encourages an integrative approach to treatment,

incorporating cognitive-behavioral, dialectical behavior, humanistic, and psychodynamic

modalities.

Our Staff

Kevin Wethey, M.D.

Owner and Founder

Ramzi Jneid

Chief Financial and People's Officer

Tiffany

Billing & Office Manager

Monica

Front and Back Office Medical Assistant

Interested in joining our growing team?

Contact us.

Book Your First Appointment

New patients can book their first appointment through ZocDoc
Check Provider Availability

  • Contact
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Mentality BHC

750 North Diamond Bar Boulevard, Suite 212, Diamond Bar, CA, USA

909-460-8733

Copyright © 2026 Mentality Behavioral Health Center - All Rights Reserved.

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Now offering TMS Therapy!

We're excited to be expanding our services to include Transcranial Magnetic Stimulation (TMS). 


Availability and eligibility will be determined through clinical assessment. 


Contact us to learn more. 

Click to learn more about TMS