He was nominated for a Pulitzer Prize for the piece "Black Spring in Valdez," written for "The Village Voice" about the Exxon Valdez oil spill in 1989; Keeble arrived at the site on April 8, 1989, and traveled back and forth from his home in Spokane County, Washington, to interview fishermen and Native Americans, public and corporate officials, and hundreds of scientists for the human-caused environmental disaster.