John C. Koen is a Founder and Managing Member at Halzer Group at Halzer Group. He possess expertise in information security, security, networking, computer security, network security and 57 more skills. He is proficient in Spanish. Colleagues describe him as "John and I worked together for several years in a demanding environment, where all levels are support were required from basic administration up to new engineering of servers and systems. Security was a critical goal of most projects and an ongoing administrative requirement. John demonstrated a great deal of knowledge and expertise in the field and was instrumental in many new secure designs, as well as tracking down and correcting security vulnerabilities in real time. John always had the answer I needed or he researched it and got back to me within a reasonable amount of time to get my projects done. John and I exchanged our expertise on a number of subjects, and we found each others' experiences to be complimentary. John works diligently, is a great team member, does his homework, stays current, and gets the job done right. I highly recommend him as a technical security expert.", "John is extremely intelligent and expert in Cyber security and related areas. His ability to think different and make things happen is what amazed me always. His dedication and passion will surely make him the best in this field and life for sure. It was great knowing him and working with him on few critical tasks.", and "John is a security professional of the highest caliber, and is a go-to person when it comes to tough security problems that need to be solved quickly. I can personally attest to his devoted interest in information/network security over the past 15 years, from which he has developed an intricate, esoteric personal knowledge base that his clients and associates swear by. If you want something done efficiently and correctly, John is your man."