Hassinger moved to Rockport in 2014 after serving 30 years with Travis County Emergency Services District (ESD) No. 5, the last 21 years in various EMS administrative roles. He has also worked 27 years with the City of Austin, where he was actively involved in the Emergency Medical Services Department and the STAR Flight program. He also served 37 years in various roles as a volunteer Firefighter/Paramedic, Fire Chief, ESD Board Member, and ESD President.
Since retiring to Rockport, he has been actively involved in the community, including serving as President of the Harbor Oaks Property Owners Association, Co-Chair of the YMCA Development Committee, and as Co-Chair of the Rockport-Fulton Chamber of Commerce's SeaFair. In 2014, Hassinger also led the City's effort examining emergency medical services.