Mr. Stephen Dennis provides leadership and guidance for research, development and deployment of advanced computation and data analytics for the Homeland Security Advanced Research Projects Agency (HSARPA) of the Science & Technology (S&T) Directorate and the Department of Homeland Security (DHS). As the Director of the Data Analytics Engine, Mr. Dennis leads a diverse team of subject matter experts to address a variety of homeland security challenges, including automated risk assessment, social media analytics, and data driven investigations for homeland security applications using big data and internet of things technologies. Mr. Dennis also serves HSARPA as the S&T APEX Program Manager for the Border Enforcement Analytics Program to improve utilization of DHS Big Data sources for ICE Homeland Security Investigations. This program has delivered the first open source platforms for big data analytics to ICE to support homeland security investigations. Mr. Dennis also represents S&T to cross-departmental working groups and represents DHS analytics interests to working groups within the White House Office of Science and Technology Programs. Mr. Dennis has more than thirty-five years of experience managing research programs in information analysis and processing automation within the Intelligence & Defense Communities and in partnership with other federal agencies. Mr. Dennis holds MBA and a M. S. in Electrical Engineering degrees from the University of Maryland, College Park, and a BS in Computer Engineering from Clemson University in SC.