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

Thrive Center for Health

Our Team

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, 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.

Amanda, Licensed Counselor

Amanda is a licensed professional counselor working in the field of therapy for 10 years. Her passion is working with clients suffering from trauma, depression and anxiety. She received her master’s degree from Central Michigan University and is trained in Eye Movement Desensitization and Reprocessing (EMDR), level 3 Internal Family Systems (IFS), and is a certified trauma focused yoga instructor. Amanda was led to psychedelic therapy through her years of working with trauma, most recently training to become an MDMA therapist with the Multidisciplinary Association for Psychedelic Studies (MAPS) and Polaris Insight Center for Ketamine Assisted Psychotherapy.

Amanda believes that ketamine can be a powerful tool to help people work through areas of difficulty, stuckness, and lifelong patterns that other modalities haven’t been able to treat. She seeks to create a safe and caring container for each person she works with so they can explore areas in their psyche that may have been difficult to work with in other ways. Amanda looks forward to working with you to help you develop a richer relationship with your inner healer.

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.

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