Our Oak Health Foundation Board

The team and board members of the Oak Health Foundation


Esther Park, DO

Esther Park, D.O.

Dr. Park is a board certified child & adolescent, and adult psychiatrist. Her pre-med studies were completed at UCLA. She trained to be a doctor at Kirksville College of Osteopathic Medicine, and did her psychiatric specialty training at LAC/USC Medical Center. Dr. Park has more than 17 years of outpatient clinical experience treating children and adults and has supervised mid-level practitioners since 2015. Her desire is, “I truly hope everyone can receive the proper care when necessary and to discover their true identity and the wonderful purpose of their lives by knowing Jesus!"

Mijin Park, PsyD

Mijin Park, PsyD

Mijin Park, PsyD is a licensed clinical psychologist who provides psychological services for clients of all ages. A graduate from the Chicago School of Psychology, Dr. Park is an expert in intergenerational conflict within multicultural families. Dr. Mijin performs psychological assessments for ADHD, executive functioning, and emotional dysregulation, among others. She particularly enjoys working with adolescents and providing their parents with effective skills and strategies for fostering their children’s growth. She has experience supervising pre-licensed therapists (Associate Marriage Family Therapist or Psychological Assistant) since 2018. In her spare time, Dr. Park enjoys cooking, hiking, and gardening.

Board Members

Image of Roger Heuser

Roger Heuser, PhD, Co-Chair

Professor of Leadership Studies, Vanguard University

Image of Andrew Brewer

Andrew Brewer, Treasurer

Practice Manager, Oak Health Center & Great Responsibility Consulting

Image of Shane Brewer

Shana Brewer, Secretary

Senior Global Marketing Manager, Veeam Software

Image of Pastor Yung Kimg

Pastor Yung Kim

Pastor of Revive Presbyterian Church of Silicon Valley

Image of Christy Hyun

Christy Hyun

Licensed Marriage and Family Therapist 

Image of Mick Yanko

Mick Yanko, Community Engagement Task Force Chair

Software Developer, Goodwill of Orange County

Image of Gayle Heuser

Gayle Heuser

Senior Chaplain, Silverado Hospice Orange County

Image of Kristi Nichols

Kristi Nichols

Senior Manager of Marketing, Orange County Rescue Mission

Image of Donna Lee

Donna Lee

Assistant Practice Manager, Oak Health Center

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Renew & Revive Spiritual Group Sign Up

This Renew & Revive (R&R) group is a program established by the team at Fully Health to provide a comprehensive approach to address all our needs – physical, mental, and spiritual. Through attending these complimentary group sessions, you will learn about the good news of Jesus Christ and how God will intervene during our journey toward achieving healing and greatest potential.

All individuals 18+ are welcome to attend! You do not need to be a Fully Health client or patient to attend. This service is free of charge. Please note, these sessions are not a clinical service. You may come and go as you like. We would be happy to have you whenever you may be available to join!

Wednesdays 7:30 – 8:30 pm on Zoom

What to expect from R&R
– To deeply understand, believe, and enjoy the Gospel, and know who I am
– To be able to have any question answered without judgment. For example, “Why am I struggling so much even though I have faith?” and “If I seek psychiatric treatment, does that mean my faith is small?”
– To experience the ability to fight the spiritual battle in life, especially regarding mental health struggles around me
– If Jesus is the Christ who solved my fundamental spiritual problem that led to all the “bad fruits” of life, then He is the answer to any other problem (mental and/or physical) that I may face on this earth.