Ernest James Istook Jr. was a Republican member of the U.S. House of Representatives representing Oklahoma's 5th district from 1993 to 2007. He declined to run for reelection in 2006, choosing instead to pursue the governorship of Oklahoma.
OpenSecrets.org, a grantee of the Sunlight Foundation, maintains an up-to-date list of the former members who have become Lobbyists after leaving Congress. Rep. Ernest Istook (R-OK) may be listed there.