Clinicians

Esther Nyarko, NP

 Esther Nyarko is licensed by the Texas Board of Nursing as an Advanced practice Registered Nurse and is certified through the American Association of Nurse Practitioners. She has more than nine years of nursing experience working in varied settings. She received her Master of Science degree as a Family Nurse Practitioner from The University of Houston and her Bachelor of Science degree (Nursing) from Capital University, Columbus Ohio.

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Theresa Thompson, NP

Theresa Thompson, NP  is licensed by the Texas Board of Nursing as a Registered Nurse and is a certified Clinical Nurse Practitioner. Before joining US Pain & Spine, she had more than 5 years of experience in pain management and palliative care. She received her post-Master’s Certificate as an Adult Nurse Practitioner,  her Master of Science degree and her Bachelor of Science degree from The University of Texas at Houston.

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Rosa Rances, NP

Rosa Rances is licensed by the Texas Board of Nursing as a certified Adult-Gerontology Nurse Practitioner. She has more than 18 years of diverse nursing experience caring for adult patients with acute and chronic illnesses before joining US Pain & Spine. She received her Master of Science in Nursing Degree from Walden University in Minnesota and her Bachelor of Science in Nursing Degree from The Bicol University, Philippines.

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Thomas B. Gillen, PA-C

Tom Gillen, PA-C is licensed by the Texas Medical Board as a Physician Assistant and is certified by the National Commission on the Certification of Physician Assistants (NCCPA). He completed his Physician Assistant training at Cornell Medical College in New York City, received his MBA from Temple University in Philadelphia, and obtained his Bachelor’s degree from Villanova University.

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Sandra C. Henke, RN, MS, ANP, CNS

Sandra Henke is licensed by the Texas Board of Nursing as a Registered Nurse and is a certified Clinical Nurse Practitioner. Before joining US Pain & Spine, she had more than 25 years of nursing practice experience at MD Anderson Cancer Center in Houston. She received her post-Master’s Certificate as an Adult Nurse Practitioner from UTMB Galveston, her Master of Science degree from Texas Woman’s University and her Bachelor of Science degree from Southern Illinois University, Edwardsville.

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Chuck Maduka, MS, PA-C

Chuck Maduka, MS, PA-C is licensed by the Texas Medical Board as a Physician Assistant and is certified by the National Commission on the Certification of Physician Assistants (NCCPA). He received his Masters of Physician Assistant degree in 2009 from Methodist University in North Carolina, and has been practicing pain management since. He received his Bachelors of Science degree from Georgia College and State University with a double major in Computer Science and Economics in 2004.

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Vivien Onyekwere, MSN, RN, NP-C

Vivien Onyekwere is licensed by the Texas Board of Nursing as a Registered Nurse and is a certified Adult/Geriatrics Nurse Practitioner. She is familiar with treating chronic pain as well as both acute and chronic diseases in adult populations. She received both her Master of Science in Nursing and her Bachelor of Science in Nursing degrees from UTMB Galveston.

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