About

I am an Assistant Professor in the Division of Geriatric Medicine and Gerontology of the Johns Hopkins School of Medicine, the core faculty in the interdisciplinary Center on Aging and Health (COAH) at Johns Hopkins where I am the Director of the Accelerometry Resource. I hold a joint appointment in the Departments of Biostatistics at the Johns Hopkins Bloomberg School of Public Health.

I have over 7-years of experience in the analysis and management of high-dimensional, high-throughput biological data collected with wearable devices in both children and adults. As a leader and founder of the Accelerometry Resource (accelerometry.org), I have designed and overseen the collection, management, processing, and analysis of free-living, multiday, sub-second, tri-axial wearable accelerometry data in over 12 000 participants/visits across multiple large, high-impact, NIH-funded observational studies and clinical trials. These studies include: 1) Study To Understand Fall Reduction and Vitamin D in You (STURDY), 2) Characterizing Resiliencies to Physical Stressors in Older Adults (SPRING), 3) Baltimore Longitudinal Study of Aging (BLSA), 4) Peripheral Artery Disease Study of SOL (PASOS), 5) Atherosclerosis Risk in Communities (ARIC), 6) Aging, Cognition and Hearing Evaluation in Elders (ACHIEVE), and 7) Chronic Kidney Disease in Children (CKiD). The Accelerometry Resource is effectively the largest repository of harmonized, sub-second level, wrist accelerometry data in older adults.

I have contributed to the field of sub-second wearable accelerometry analysis in medicine and public health by introducing measures, statistical methods, and algorithms crafted for the extraction of characteristics of walking strides and ambulation in older adults, including low-mobility individuals. I have shown that data collected remotely with wearable physical monitors can be a source of valuable information on gait mechanics that are strongly related to measures of physical performance, fatigability, and fitness and strong predictors of fall risk in older adults.