is a faculty Member in the Department of Epidemiology and Cancer Control at St. Jude Children’s Research Hospital and maintains a clinical appointment through the Department of Psychology. He received his PhD from Florida State University, with an emphasis in Clinical Psychology and Neuroscience. He then completed a clinical psychology internship, clinical neuropsychology residency, and biological psychology fellowship at the University of Oklahoma Health Sciences Center. At St. Jude, Dr. Krull is Director of the Cognitive Neuroscience Laboratory, where he oversees long-term survivorship research involving neurocognitive, neuroimaging and neurologic outcomes. He has published over 200 peer-reviewed manuscripts, and is the recipient of multiple research grants, from the National Cancer Institute and the National Institute of Mental Health, including a T32 training grant for postdoctoral fellows. His research is focused on central nervous system integrity and function in long-term survivors of childhood leukemia and lymphoma. He also leads clinical trials targeting sleep and neural stimulation, aimed at improving central nervous system outcomes. In addition to his research efforts at St. Jude, Dr. Krull is Chair of the Psychology Working Group for the multi-institutional Childhood Cancer Survivor Study and is a member of the Survivorship and Outcomes Steering Committee in the Children’s Oncology Group (COG). He also leads efforts in COG and the Internal Guidelines Harmonization Group to establish and update long-term follow-up guidelines focused on neurocognitive outcomes in survivors of childhood cancer.