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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

 

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.

 

Gerald Goco, PMHNP

Paul Arredondo, PMHNP

Gerald is accepting new patients.


Gerald is a board certified, mental health nurse practitioner.

Nancy Rehfeld, PMHNP

Paul Arredondo, PMHNP

Paul Arredondo, PMHNP

Nancy is a board certified, mental health nurse practitioner

Paul Arredondo, PMHNP

Paul Arredondo, PMHNP

Paul Arredondo, PMHNP

Paul is accepting new patients.


Paul is a board certified, mental health nurse practitioner. 

Shana Garcia, PsyD

Catherine Veliz, LMFT

Catherine Veliz, LMFT

Dr. Shana Garcia is a licensed clinical psychologist, specializing in individual psychotherapy.

Catherine Veliz, LMFT

Catherine Veliz, LMFT

Catherine Veliz, LMFT

Catherine is accepting new patients.


Catherine is a Licensed Marriage and Family Therapist who works with individuals and couples. She is passionate about supporting the Latinx community and helping clients navigate family dynamics, generational challenges, and identity concerns. Catherine uses a integrative, client-centered approach drawi

Catherine is accepting new patients.


Catherine is a Licensed Marriage and Family Therapist who works with individuals and couples. She is passionate about supporting the Latinx community and helping clients navigate family dynamics, generational challenges, and identity concerns. Catherine uses a integrative, client-centered approach drawing from CBT, mindfulness, positive psychology, and strengths-based interventions to create a warm, collaborative, and empowering therapeutic space.

Our Staff

Kevin Wethey, M.D.

Owner and Founder

Ramzi Jneid

Chief Financial and People's Officer

Tiffany

Billing & Office Manager

Monica

Medical Assistant and Receptionist

Interested in joining our growing team?

Contact us.


  • Contact
  • Policies

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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TMS Therapy Coming Soon

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