Dr. Matthew Hejduk has spent almost thirty years in the design, development, and assessment of space sensing and command and control systems.  He holds degrees from Princeton University, Southern Methodist University, and the University of Dallas; and he presently serves as chief engineer for the spacecraft Collision Avoidance and Risk Assessment (CARA) project at NASA Goddard Space Flight Center.  His research interests include advanced aspects of the satellite conjunction assessment problem, satellite characterization and modeling from non-time-series signature data, satellite orbit determination and characterization, and sensor and network simulation.