Nitrogen producer CVR Partners LP said Nov. 1 that President and CEO Byron Kelley has elected to retire effective Jan. 1, 2014. Replacing Kelley will be Jack Lipinski, executive chairman of CVR Partners, who was the company’s president and CEO prior to Kelley’s appointment in May 2011. Lipinski also serves as president and CEO of CVR Energy Inc., which owns a majority of the common shares of CVR Partners.