Ken Kies, who held two top jobs at the Treasury Department and the I. R. S., is leaving the government.

His departure marks a significant shift in the Trump Administration's tax policy leadership. Kies served as both the Treasury's assistant secretary for tax policy and as the IRS chief counsel, giving him unusual dual authority over tax regulation and enforcement. Colleagues describe him as a steady hand during turbulent rulemaking periods, including the implementation of the 2017 tax overhaul.

His exit comes amid ongoing debates over Treasury's regulatory agenda and IRS modernization efforts. The White House has not yet announced a successor for either position, leaving critical tax policy roles vacant during a pivotal legislative window.