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Gary D. has worked at a variety of companies since 1998. Gary began their career at BTG, Inc as a Research and Development Engineer. Gary then moved to GE, where they worked as a Software Engineer - Robotics. After that, they joined JBISoft, Inc as a Research and Development (R&D) Solutions Engineer. In 2003, Gary D. began working at CACI International Inc as a Portfolio Manager. In 2015, they joined the US Government as Staff. Gary then worked at Raytheon as a Senior Program Manager in 2016. In 2017, Gary D. became the Chief Technology Officer at Castalia Systems. Additionally, they have been a part of the U.S. Navy Reserve since 2013, serving as an Engineering Duty Officer and a Cryptologic Warfare Officer.

Gary D. has obtained a Doctor of Philosophy (Ph.D.) in Information Systems and Information Security from Nova Southeastern University, a Master of Business Administration (MBA) from Indiana University - Kelley School of Business, a Master's degree in Computer Science and Information Security from James Madison University, and a Bachelor's degree in Computer Science from James Madison University. Gary also holds a number of certifications, including Accredited Systems Engineer - ArcSight Analyst V1 from ArcSight, Certified Information Security Manager (CISM) from ISACA, Certified Information Systems Auditor (CISA) from ISACA, Certified Information Systems Security Professional (CISSP) from (ISC)², Certified in the Governance of Enterprise IT (CGEIT) from ISACA, CompTIA Project+ from CompTIA, CompTIA Security+ from CompTIA, IBM Certified Analyst - i2 Analysts Notebook V9 from IBM, Open Water Scuba Instructor from SDI TDI ERDI, Open Water Scuba Instructor from NAUI Worldwide, and Project Management Professional (PMP) from Project Management Institute.