(Philadelphia, PA) -- Thornton B. Alexander Mason II, MD, PhD, has accepted the position of Assistant Professor in both the Departments of Neurology and Pediatrics at the University of Pennsylvania School of Medicine.

After earning his medical degree from Medical College of Virginia, he took his first residency in Pediatrics at Tulane University Medical Center and then went on to Columbia-Presbyterian Medical Center for a residency in Pediatric Neurology. In 2000, he completed his PhD in Neurobiology at Columbia University, and became a fellow in Sleep Medicine at Children's Hospital of Philadelphia. In addition, he received a National Research Service Award Post-Doctoral Fellowship at Penn, providing him the opportunity to further his research. Mason is currently an attending neurologist at Children's Hospital of Philadelphia.

Prior to coming to Penn, Mason was Assistant Professor of Clinical Neurology and Clinical Pediatrics at the College of Physicians and Surgeons, Columbia University. He is board certified in Pediatrics and Neurology with Special Qualification in Child Neurology.

Mason's clinical research interests focus on pediatric sleep disorders. He was recently awarded a mentored research career development grant from NIH to study periodic limb movements in sleep (PLMS) in children with Williams Syndrome (WS). Mason will investigate to see if the PLMS is determined by WS. The research will also serve to provide new insights into WS as a model for PLMS in the general population, and possibly identify a specific gene(s) implicated in the origin of the movements.

Mason has co-authored a number of original research studies in peer-reviewed journals, as well as abstracts and book chapters. He is a member of several national professional and scientific organizations, including the American Medical Association, the American Academy of Neurology, the American Academy of Pediatrics, the Child Neurology Society, the Society of Neuroscience and the Sleep Research Society.


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Penn Medicine is one of the world’s leading academic medical centers, dedicated to the related missions of medical education, biomedical research, and excellence in patient care. Penn Medicine consists of the Raymond and Ruth Perelman School of Medicine at the University of Pennsylvania (founded in 1765 as the nation's first medical school) and the University of Pennsylvania Health System, which together form a $7.8 billion enterprise.

The Perelman School of Medicine has been ranked among the top five medical schools in the United States for the past 20 years, according to U.S. News & World Report’s survey of research-oriented medical schools. The School is consistently among the nation’s top recipients of funding from the National Institutes of Health, with $405 million awarded in the 2017 fiscal year.

The University of Pennsylvania Health System’s patient care facilities include: The Hospital of the University of Pennsylvania and Penn Presbyterian Medical Center — which are recognized as one of the nation’s top “Honor Roll” hospitals by U.S. News & World Report — Chester County Hospital; Lancaster General Health; Penn Medicine Princeton Health; Penn Wissahickon Hospice; and Pennsylvania Hospital – the nation’s first hospital, founded in 1751. Additional affiliated inpatient care facilities and services throughout the Philadelphia region include Good Shepherd Penn Partners, a partnership between Good Shepherd Rehabilitation Network and Penn Medicine, and Princeton House Behavioral Health, a leading provider of highly skilled and compassionate behavioral healthcare.

Penn Medicine is committed to improving lives and health through a variety of community-based programs and activities. In fiscal year 2017, Penn Medicine provided $500 million to benefit our community.

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