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Our Team

We have 4 physicians, a nurse practitioner, and over 20 other team members dedicated to clinical care and research to improved lives of children and adults with histiocytic disorders. In addition to our team of specialists focused on histiocytosis, patients may see neurologists, radiologists, endocrinologists, orthopaedic surgeons, pathologists, and many other clinical and social specialists in order to receive the best possible care.


Dr. Kenneth McClain is Director of the Histiocytosis Program at Texas Children’s Cancer and Hematology Center and a member of the leukemia and lymphoma programs. Dr. McClain and Dr. Carl Allen see 100 newly-diagnosed patients with a variety of histiocytic diseases each year. His clinical interests… read more
Phone: 832-822-4208
Dr. Carl Allen is the Milton and Allene Nirken Chair in Pediatric Oncology at Texas Children's Hospital and co-director of the Texas Children’s Cancer Center Histiocytosis and Lymphoma Programs, where he leads a team of over 30 clinicians and scientists dedicated to improving the outcomes of… read more
Phone: 832-824-4312


I strive to provide the highest quality pediatric endocrine care in a caring manner. Clinical Interests: Pediatric diabetes, Congenital adrenal hyperplasia, Thyroid disease in children, Turner Syndrome, Growth disorders in children, Type 2 diabetes DSD, Disorders of Sexual Differentiation (DSD)
Phone: 832-822-3670 (Main) | 281-494-7010 (Sugar Land)


Dr. Olive Eckstein is a clinical expert with extensive experience in the evaluation and care of pediatric and adult patients with histiocytic disorders, lymphomas, and rare lymphoproliferative and immune disorders.  As a physician in one of the largest Histiocytosis and Lymphoma programs in the… read more
Phone: 832-824-4848
Patricia (Pat) Wills Bagnato is a certified pediatric nurse practitioner (CPNP) on the Histiocytosis/Lymphoma team at Texas Children’s Cancer and Hematology Center. She provides clinical care and support to children and families coping with histiocytic diseases or lymphoma. She has been a… read more
Phone: 832-824-6718