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Computer Science Teacher - Sioux Falls Washington High School. Mark teaches a variety of computer topics including Cyber Security (the curriculum he wrote as part of the DSU RET group), AP Computer Science Principles, and AP Computer Science A. Mark was the only teacher in South Dakota to have females take an AP exam for the 2017 school year. Table Leader for the 2017 AP Computer Science Principles Reading. Exploring Computer Science facilitator for Black Hills State University professional development workshop. WHS Advisor for the following: Media/Webstreaming, Programming Club, Rubics Cube Club, and Gaming Club.