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Samuel Justin Sinclair, PhD

Samuel Justin Sinclair, PhD, is an assistant professor in the clinical psychology program at William James College. He received a BA in psychology from Boston College, an MS in human development and psychology from Harvard University, and earned his PhD in clinical psychology from Suffolk University. 

Dr. Sinclair maintains an active clinical research program in the areas of psychological and neuropsychological assessment, psychometrics and scale development, suicide and violence risk, terrorism and political violence, and treatment outcomes. This research has led to over 60 peer-reviewed publications in professional journals, seven textbook chapters, and six books. He has been featured by a number of news outlets including the CBS Nightly News, the New York Times, and the Boston Globe

Dr. Sinclair is the coauthor of the assessment instrument SPECTRA: Indices of Psychopathology. He has also coauthored the books The Political Psychology of Terrorism Fears and The Psychology of Terrorism Fears. Recently, he opened a private practice in Sudbury, Massachusetts that specializes in psychological and neuropsychological assessment and individual psychotherapy for adults.

Areas of Expertise

  • Psychological and neurocognitive assessment
  • Psychometrics and scale development
  • Suicide and violence risk
  • Assessment and treatment of broad range of psychopathology
  • Terrorism and political violence


  • Bachelor’s degree in psychology, Boston College (1997)
  • MEd in human development and psychology, Harvard University (2000)
  • PhD in clinical psychology, Suffolk University (2007)
  • Clinical internship (2006-2007) and post-doctoral fellowship (2007-2008), Massachusetts General Hospital and Harvard Medical School

Products, Publications, and Abstracts



Appointments and Accomplishments


  • Founder and principal of his private practice in Sudbury, MA.


  • Founding editor, Behavioral Sciences of Terrorism and Political Aggression (2007).
  • President, Society for Terrorism Research (2007-2010)
  • Founder, Society for Terrorism Research (2006)