Timothy Tymkovich

Tenth Circuit judge, majority author

Appears in 1 story

Office: Judge of the United States Court of Appeals for the Tenth Circuit

Born: November 2, 1956, Denver

Education: Colorado College, University of Colorado Law School, Broomfield High School

Previous offices: Chief Judge of the United States Court of Appeals for the Tenth Circuit

Last updated Nov 2, 2026

Stories

Appeals court upholds Oklahoma environmental authority on tribal lands

Rule Changes

Wrote the 2-1 opinion upholding Oklahoma's authority

The Tenth Circuit ruled 2-1 on Oct. 16 that Oklahoma can run federal environmental programs on tribal lands, rejecting the Pawnee Nation's challenge. The decision leaves state agencies, not tribal governments, as the main regulators for air and waste permits in much of eastern Oklahoma.

Updated Oct 26