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David Kosolkit has extensive experience in engineering and security within various roles. Presently a Stationary Engineer at St. Mary's Medical Center in San Francisco since February 2008, responsibilities include operating and maintaining essential equipment and ensuring the safe and efficient operation of systems. Prior roles at St. Mary's Medical Center include Apprentice Stationary Engineer, Utility Engineer, and Supervisor of Security, overseeing the security department and training personnel. Before that, David served as Site Supervisor at Corporate Security Service, Inc. from January 2006 to February 2008, and as Staff Sergeant in the United States Marine Corps from August 1997 to August 2005, specializing in expeditionary airfield systems. David graduated from George Washington High School in 1997.