Bill Sheffield served in the United States Army before moving to Alaska, where he began a career in home appliance sales and service for Sears. He transitioned into public service, holding positions on the Anchorage Planning Commission and the Anchorage Charter Commission. Sheffield founded Sheffield Enterprises, which grew to include 19 Sheffield House hotels, before selling it to Holland America Line. He then held leadership roles at the Alaska Railroad, serving as Chairman of the board of directors and later as President and CEO. His professional background includes significant experience in both the private and public sectors, with a focus on leadership and strategic management.

Bill Sheffield's political philosophy is marked by an unusual blend of regional pragmatism and ideological steadfastness. His push to consolidate Alaska's time zones into a single one, despite significant regional backlash, highlights a calculated approach to policymaking that prioritizes uniformity over local autonomy. This tension between a broad vision and localized resistance underscores a unique ideological positioning that challenges conventional regionalist politics. Sheffield's rhetoric often emphasizes long-term strategic benefits, even when immediate local interests are sidelined, revealing a deeply strategic, if not occasionally polarizing, political style.