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David Seidman has a diverse work experience spanning over several industries. David began their career at Chesapeake Sailing Club and Yacht Charters as an Owner/Manager from 1980 to 1986. David then worked at Penn Options Co. as a Market Maker/Specialist from 1986 to 2000. In 2000, they became a Principal at Datalore/Harpo Trading until 2006. Following that, they served as the Chief Information Officer at Keystone Trading Partners from 2006 to 2009. Simultaneously, they joined PIAA as a Statewide Boys Lacrosse Rules Interpreter from 2009 to 2017. From 2009 to 2011, they worked at Algowave as a Principal. David then transitioned to the Philadelphia Stock Exchange as a Member from 1986 to 2010. In 2004, they joined US Lacrosse and held the position of Mens' Officials' National Clinician/Training Committee Chair until 2014. In 2011, they joined MIAX Exchange Group as a Business Analyst - Strategic Planning until 2014. David continued their tenure at MIAX Exchange Group with roles such as Regulatory Analyst from 2014 to 2016, Compliance Analyst from 2016 to 2019, and is currently serving as the Director - Regulatory Compliance since June 2019. Concurrently, they also served as Boys Lacrosse Rules Committee Chair at USA Lacrosse from 2016 to 2022.

David Seidman attended the University of Maryland from 1976 to 1978. Following that, they enrolled at the University of Baltimore from 1978 to 1980. No information is provided regarding the degree or field of study pursued by David Seidman during their education.