William B. McKinley began his career in banking, specializing in farm mortgages, before transitioning to public service. He attended the University of Illinois at Urbana-Champaign, which later saw him serve as a trustee. McKinley spent significant time in legislative roles, serving in the U.S. House of Representatives and the U.S. Senate. His tenure included leadership roles in both chambers, as well as a stint managing a national campaign. McKinley's professional experience also encompassed executive leadership in the transportation sector.

William B. McKinley's political career reveals a distinctive blend of regional economic advocacy and educational governance. His support for farm mortgages and leadership in interurban railway infrastructure underscores a localized approach to economic policy. McKinley's tenure as a University of Illinois trustee and his involvement in naming landmarks after himself suggest a calculated effort to intertwine personal legacy with public service. His political maneuvers, including managing a losing presidential campaign and a Senate defeat, hint at a strategic, perhaps even contrarian, political philosophy.