Transportation Hybrid Threats

Lead: John Hummel, Ph.D.

Integrated Resiliency Analysis

John R. Hummel, Ph.D. is the lead for Integrated Resiliency Analyses in the Decision and Infrastructure Sciences Division at the Argonne National Laboratory. He is the developer of the Analysis of Resiliency for Integrated System Effectiveness (ARISE) framework for assessing societal and regional resiliency. He has over 30 years of experience in developing and using modeling and simulation applications in a variety of military domains, such as environmental representations, logistics, simulation architectures, and the impacts of climate change on National Security.  He led the development of efforts to create a framework for assessing societal and regional resiliency and has also supported activities analyzing critical resilient infrastructures.  He has a Ph.D. in Atmospheric Science from the University of Michigan and a M.S. in Meteorology and B.S. with Honors Option in Engineering Science from the Pennsylvania State University. Dr. Hummel is also a Senior Fellow with the Consortium for Advanced Science and Engineering of the University of Chicago and the Northwestern-Argonne Institute for Science and Engineering.


John Contestabile

Assistant Program Manager for Homeland Security

John Contestabile is the assistant program manager for homeland security for the Johns Hopkins University/Applied Physics Lab. He joined the Lab in July 2009, after retiring from the State of Maryland Department of Transportation (MDOT), where he was acting assistant secretary for administration responsible for, among others, emergency management and homeland security. In addition, he was named acting deputy homeland security advisor by Governor Robert Ehrlich and later the director of the Maryland State Communications Interoperability Program (MSCIP), reporting to the superintendent of the Maryland State Police, by Governor Martin O’Malley.


Donald Kim Erskine

Senior Infrastructure Resilience and Threat Analyst Decision and Infrastructure Sciences Division

Mr. Erskine currently is with Argonne National Laboratory.  Kim is a retired United States Navy SEAL Officer and National and Homeland Security professional.  He has more than thirty years of experience in counter-terrorism operations, intelligence, critical infrastructure protection and preparedness planning.

Following a distinguished Naval career, he served fifteen years as a consultant and Senior Federal Employee with the U.S. Department of Homeland Security (DHS). Prior to joining Argonne, he served as the Office of Infrastructure Protection Regional Director and Chief of Protective Security for Federal Region 1 (CT, MA, ME, NH, RI, VT). 

Mr. Erskine serves as a Civil Expert on Civil-Military Cooperation and Energy Infrastructure Security for NATO’s Civil Emergency Planning Committee and provides analysis of critical infrastructure vulnerabilities to hybrid threats for the Center of Excellence for Countering Hybrid Threats in Helsinki, Finland.


Joseph J. Leonard Jr.

Principal Consultant with the PENTA Consortium

CDR Joseph J. Leonard Jr. (USCG, ret.) is a 30-year veteran of the Coast Guard and is a Principal Consultant with the PENTA Consortium, LLC. He serves as the chair of the Greater Harris County Local Emergency Planning Committee and actively serves in the U.S. Coast Guard Auxiliary. He holds designations as a Master Exercise Practitioner, Master Continuity Practitioner, Certified Emergency Manager, Certified Homeland Protection Professional, and Certified Port Executive.  He has a BA in History from the Virginia Military Institute and an MS in Engineering Technology from Murray State University.