News: Business BHP Billiton says chief executive Marius Klopper to retire in May February 19, 2013 | Modified: February 19, 2013 at 5:47 pm Leave a comment SYDNEY (AP) — BHP Billiton says chief executive Marius Klopper to retire in May. Sign Up for the Daily E-dition newsletter! Please enter your email address below to begin receiving the Daily E-dition newsletter. You must enter a valid email address in the field above! Thank you for signing up for the Daily E-dition newsletter! You should receive your first newsletter very soon. We're sorry, there was an error processing your newsletter signup. Please click here to visit our Newsletter Signup Center to register for this newsletter.