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Stephen L. Johnson
When President George W. Bush named Stephen L. Johnson EPA Administrator, Johnson became the first scientist and first career employee to hold the position. During Johnson's tenure, EPA responded to the Hurricane Katrina disaster and created the WaterSense program, which promotes water-efficient products and services. Johnson's EPA also cut pollution with stronger lead standards, a new rule for off-road diesel vehicles, and tougher standards for marine and locomotive diesel engines.