John Hagaman is originally from Rockwall, Texas. He earned a bachelor of business administration in marketing and public relations and a master's degree in management and leadership from Tarleton State University. He has a wife and son, and is a member of First United Methodist Church Rockwall.

John currently serves as president and chief executive officer of Star Outdoor, a commercial landscape site management company serving landlords and property managers across North Texas. He previously served as president and chief executive officer of ekin Nutrition, a rebranding of a chain of Max Muscle Sports Nutrition franchise locations in North Texas which he founded previously. Earlier in his career, John worked as a territory manager at Graphic Solutions Group, Incorporated and as a senior account executive at Cranford Johnson Robinson Woods, an advertising and public relations firm in Dallas. John is currently a member of the Rockwall Planning and Zoning Commission. He was appointed to the City of Rockwall Architectural Review Board in 2023 and then to the Planning and Zoning Commission in 2024.

John's campaign for Rockwall City Council Place 4 is his first run for elected office.