Smith International ( SII) named Don McKenzie CEO of its M-I Swaco unit, effective April 30. Don will replace Loren Carroll, who has been CEO of the unit since 1994. Loren Carroll will remain with Smith International for two years as an adviser. "Don McKenzie has over 30 years of oilfield experience. His extensive experience with M-I SWACO and other Smith operations, makes him the perfect person for this job," said Smith chief Doug Rock.