Ruth Mulan Chu Chao
Four of Chao's six daughters attended the business school , including former United States Secretary of Labor and Secretary of Transportation , Elaine Chao . 
<triplet> Secretary of Transportation <subj> Elaine Chao <obj> officeholder <triplet> Elaine Chao <subj> United States Secretary of Labor <obj> position held <subj> Secretary of Transportation <obj> position held