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

Thrive Center for Health

Our Team

Thrive’s Core Values

Delivering alternative treatments to ease human suffering through integrative care

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Compassionate

We meet patients where they are in their healing process and provide empathetic care.

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Approachable

We actively listen to both our patients and coworkers, and are open to communication.

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Inspiring

We inspire each other and our patients to keep going.

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Dedicated

We love what we do, and are all here to provide better patient care/experiences.

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Authentic

We are each truly ourselves and allow others to do the same.

What Makes Thrive Unique

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Peaceful Environment

Our office is surrounded by nature.

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Integrative Care

Numerous ways to helps patients (well rounded service).

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Psychedelic Interventions

Knowledgeable in the psychedelics industry and have a proven team for it.

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:

2021 – current   SANFORD RECOVERY SERVICES

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 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.

Mark by Thrive Center for Health in Grand Rapids, MI

Mark Varney, LMSW

Interim Group Therapist

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Lee Diener, DNP, PMHNP-BC, AGPCNP-BC

Lee is a board certified Psychiatric and Mental Health Nurse Practitioner (PMHNP) and Adult/Geriatric Primary Care Nurse Practitioner (AGPCNP). She received a BA in Anthropology from Cornell University, a BSN from Ohio University and a DNP from Grand Valley State University. Prior to completing her DNP in 2021, Lee has practiced as a registered nurse since 2012 in emergency and psychiatric settings. She has also received training in ketamine-assisted psychotherapy through Polaris Insight Center.

Lee looks forward to partnering with individuals and families to help identify, clarify and plan care for their mental and behavioral health needs.

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Erika , RN

Erika has been a nurse for eight years, and started in the clinic in 2022. She loves lending support to individuals as they navigate their unique circumstances. She joined the clinic to continue making a positive impact on people’s lives. Her fun fact is that she recently learned to scuba dive!

Kim by Thrive Center for Health in Grand Rapids, MI

Kim , RN

Kim has been a nurse for 22 years, and she started working at the clinic in 2022. She enjoys working at the clinic because she has a passion for helping people live a healthier life, and she enjoys the difference she is making in others lives at the clinic. Her fun fact is that she Youngest of 7, and she grew up in Ohio, and she loves to Travel.

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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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Melissa Kreger, Business Manager

Melissa graduated from Michigan State in May of 2022, since then she has taken on the role as Thrives business manager. Thrive means a lot to her, getting mental health care to those who need it most has proven to be a strong passion of hers. Joining the Thrive team has allowed Melissa to grow in the space of mental health and she is elated to be here, and be an advocate for everyone. Her fun fact is that she played 10 years of travel softball white growing up.

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