He is co-director of the Fayez Sarofim Lymphoma Program research laboratory at Texas Children's Cancer and Hematology Centers. Dr. Allen has significant experience in clinical as well as translational research. He is principal investigator of investigator-initiated clinical trials in Hodgkin lymphoma and non-Hodgkin lymphoma, both of which include correlative biology aims. He is national principal investigator of a study to optimize hematopoietic cell transplant in patients with EBV-related lymphoproliferative disorders, through the Blood and Marrow Transplant Clinical Trials Network.