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847 Parchment Drive, Suite 105, Grand Rapids, MI 49546

Thrive Center for Health

Our Team

Dr Masterson bio shot by Thrive Center for Health in Grand Rapids, MI

Dr. Gilbert Masterson

Dr. Gilbert Masterson is a board-certified psychiatrist with specialization in child psychiatry. He currently serves as the chief medical officer for Sanford Health. Prior to returning to West Michigan, Dr. Masterson was the medical director of inpatient psychiatric services at Cleveland Clinic Akron General. During that time, he worked extensively utilizing ketamine for psychiatric illnesses. Prior to returning to west Michigan, Dr. Masterson sought out the availability of ketamine infusions on an outpatient basis for his patients. This led to a partnership between Thrive Center for Health and Dr. Masterson.

Professional Background:


2015 – 2021 CLEVELAND CLINIC AKRON GENERAL – Akron, OH Medical Director of Inpatient Psychiatric Services

2009 – 2015 PINE REST PSYCHIATRIC HOSPITAL – Grand Rapids, MI. Medical Director of Inpatient/Partial Child & Adolescent Psychiatric Services. Assistant Clinical Professor Psychiatry Michigan State School of Human Medicine.

2001 – 2009:   FOREST VIEW PSYCHIATRIC HOSPITAL – Grand Rapids, MI. Medical Director of Inpatient Psychiatric Services. Medical Director for Trauma Recovery Center

1993 – 2001: PINE REST PSYCHIATRIC HOSPITAL – Grand Rapids, MI. Medical Director of Child & Adolescent Psychiatric services. Medical Director of ADHD Institute. Medical Director of Adolescent Residential Services. President of Medical Staff (1997-1999).

1991 – 1993: KNOLLWOOD PSYCHIATRIC AND CHEMICAL DEPENDENCY CENTER – Riverside, CA. Medical Director of Inpatient Psychiatric Services. Medical Director of Inpatient Chemical Dependency Services.

1989 – 1991: LOMA LINDA UNIVERSITY MEDICAL SCHOOL – Loma Linda, CA. Medical Director of Inpatient and Partial Hospital Services

1985 – 1988: UNIVERSITY OF CALIFORNIA, LOS ANGELES – Los Angeles, CA; Neuropsychiatric Institute. Director of Training for the Child Psychiatry Program. Chief of Psychopharmacology Clinic. Assistant Clinical Professor of Child Psychiatry.

1985 – 1986: CHARTER BAYWOOD HOSPITAL –Long Beach, CA. Medical Director of Inpatient Psychiatric Services

1981 – 1983: MASSACHUSETTS GENERAL HOSPITAL –Boston, Massachusetts Staff Physician

Educational Background:

1971 – 1975: UNIVERSITY OF OREGON – Eugene, Oregon. B.S. in General Science.

1976 – 1980: LOMA LINDA UNIVERSITY SCHOOL OF MEDICINE – Loma Linda, California. M.D. Degree.

1980 – 1981: ST. LUKE’S/DENVER GENERAL HOSPITAL – Denver, Colorado. Rotating Internship.

1981 – 1983: HARVARD UNIVERSITY SCHOOL OF MEDICINE – Boston, Massachusetts Residency Training in Adult Psychiatry.

1983 – 1985: UNIVERSITY OF CALIFORNIA AT LOS ANGELES – Neuropsychiatric Institute, Los Angeles, CA. Fellowship in Child Psychiatry.

Celeste Kreger by Thrive Center for Health in Grand Rapids, MI

Celeste Kreger, MSN, CRNA

Celeste Kreger is a Certified Registered Nurse Anesthesiologist. She received her BSN from Ferris State University and her MSN from Case Western Reserve University. Prior to graduate study, her 5 years of nursing experience included general medical, post anesthesia care and critical care. Celeste has been published in Nursing Journal, Journal of Neuroscience Nursing and Nursing Management.

Celeste has been a ketamine provider with Thrive Center for Health since 2018. She is a member of The American Society of Ketamine Physicians, Psychotherapists, and Practitioners (ASKP3). Her ketamine educational training includes annual ASKP3 conferences and ongoing continuing education.

Their mutual goal of providing outstanding care and compassion for all patients led to the desire to work together in caring for patients who could benefit from ketamine therapy. Celeste’s background as a bedside nurse and as an anesthesia nurse have provided her with a unique perspective on caring for patients.

In addition to working with Thrive Center for Health, Celeste also provides anesthesia in outpatient and office-based settings.

SPP bio pic 2 by Thrive Center for Health in Grand Rapids, MI

Sarah Parks-Pittman, LMSW, CHT

Licensed Clinical Social Worker
Certified Hakomi Therapist
Brainspotting Practitioner

I believe that it is every person’s birthright to live a life full of meaning, joy and fulfillment.
My counseling practice is informed by Hakomi and its principle of mindfulness, unity, body-mind connection, non-violence and organicity.  Hakomi has been described as “assisted self-study”.  It is an experiential type of psychotherapy that encourages individuals to enter into mindfulness to help access present moment experiences, which leads to insight, healing and integration.  It is a way of cultivating conscious self-compassion and transforming patterns of perception and behavior that no longer serve.

Other models which inform my counseling approach include person-centered, humanistic, strengths-based, trauma informed, depth psychology and cognitive behavioral.  We will work collaboratively to determine the therapeutic approach that best suits your needs and preferences.

With more than seven years in the mental health field, I am an experienced child and family therapist as well as group facilitator.  My work is inspired by each individual client’s unique potential for wholeness.  I particularly enjoy working with couples and individuals on issues of gender, sexuality, relationships, intimacy, spirituality, wellness and authenticity.  I am LGBTQIA+ friendly and aware.  My other areas of competence include anxiety, depression, grief, and adjustment to life transitions.  I look forward to assisting you on your personal journey of healing and self-discovery! 

Erika by Thrive Center for Health in Grand Rapids, MI

Erika , RN

Autumn by Thrive Center for Health in Grand Rapids, MI

Autumn , RN

Kim by Thrive Center for Health in Grand Rapids, MI

Kim , RN

Katelyn Administrative Assistant by Thrive Center for Health in Grand Rapids, MI

Katelyn, Administrative Assistant

Katelyn is our administrative assistant at Thrive Center for Health. Katelyn attended Western Michigan University, initially focusing on speech pathology, later changing her major to family studies. She is still focusing on continuing her education. Her bubbly personality and contagious smile is usually the first thing you see when you enter our office. She is always here for our patients to share compassion, optimism, and kindness. She is a passionate advocate within the mental health community and strives to support and uplift those who struggle with mental health or chronic pain.

Emily by Thrive Center for Health in Grand Rapids, MI

Emily, Front Desk and Billing Assistant

Emily is our front desk and billing assistant.  She has a Masters in Public Administration with an emphasis in Health Administration from Grand Valley State University, with a background primarily in non-profit fundraising, but specifically she has a passion for reducing the stigma of mental illness in society. 

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