John Whalen graduated from Thomas McKean High School and pursued higher education in political science and history at the University of Delaware, followed by studies in criminal justice at Delaware Technical & Community College. Early in his career, Whalen managed retail operations for a men's clothing chain, eventually becoming a district manager before the company's closure. He then worked in various roles, including teaching GED classes, before joining the Delaware Department of Public Safety, Division of State Police. Whalen retired from public safety after two decades and founded a residential construction company, where he remained active for over twenty-two years.

John Whalen's political identity is marked by a blend of staunch conservative positions on immigration and the Second Amendment, coupled with an unexpected advocacy for European involvement in foreign conflicts. His rhetoric on illegal immigration and national debt reveals a rigid stance against perceived federal failures, yet his support for European engagement in conflicts like Ukraine diverges from typical isolationist rhetoric. Whalen's pro-life stance on abortion, framed as a moral issue, adds another layer to his ideological positioning, suggesting a deeply principled approach to contentious social issues.