Who we are

Luther G Kalb, PhD


Dr. Luther (Luke) G. Kalb is jointly appointed as Assistant Professor in the Center for Autism and Related Disorders and the Department of Neuropsychology at the Kennedy Krieger Institute  (KKI) as well as the Department of Mental Health (DMH) at the Johns Hopkins Bloomberg School of Public Health (JHBSPH). He received his doctoral degree in the DMH at JHSPH, under Dr. Elizabeth Stuart, PhD, as an NIMH Children's Mental Health Services research fellow. Dr. Kalb is Co-Chair of the Research Committee for the START National Team, which is located within the Institute on Disability at the University of New Hampshire, and affiliated with the Intellectual Developmental Disabilities Research Center at KKI and Wendy Klag Center for Autism and Developmental Disorders at JHSPH. 


Dr. Kalb is a public health researcher whose primary line of work involves understanding the phenomenology, epidemiology, and treatment of mental health crises. His work also includes investigating psychiatric service utilization, the effectiveness of community-based mental health programs, psychometrics and measure development, use of health information systems and emerging technologies to improve clinical care. His research has been supported by the NICHD, Autism Speaks, and Johns Hopkins University.  

Calliope Holingue, MPH

PhD Candidate

Calliope Holingue is a PhD Candidate and fellow in the Psychiatric Epidemiology Training program in the Department of Mental Health at Johns Hopkins Bloomberg School of Public Health. Prior to her PhD, she received her BA in public health and molecular cell biology and her MPH in epidemiology/biostatistics from University of California, Berkeley.


Calliope’s research focuses on the intersection of physical and mental health and how to leverage that understanding to elucidate etiology and improve patient care. She is particularly interested in autism spectrum disorder and other neurodevelopmental conditions, and has a special interest in the role of the gut-brain axis in psychiatric disorders.


Her doctoral research is concerned with understanding the link between the gastrointestinal system and gut microbiome and Autism Spectrum Disorder. She has published several scientific papers in journals such as Autism Research, Journal of Neurology & Neuromedicine, and Arthritis & Rheumatology. Her work has been supported by the Johns Hopkins University Center for Innovative Care in Aging, The Wendy Klag Center for Autism and Developmental Disabilities, and the National Institute of Mental Health (NIMH).

People who think they know everything are a great annoyance to those of us who do - Isaac Asimov

Emma Stapp, PhD

Postdoctoral Fellow

Dr. Stapp is a postdoctoral fellow in the Merikangas lab at NIMH. Her main research interests are family and child wellbeing; the intersection of mental and physical health, especially as it relates to stress, health risk behaviors, and chronic disease; and the interplay of biological and environmental risk and protective factors in the causes, correlates, and consequences of mood spectrum disorders.  Dr. Stapp has a long-range interest in translating research findings to maximize healthy behaviors and environments for youth and families at high risk for developing, or who are already suffering from, severe, common, multigenerational disorders (e.g., mood, substance).