COO and current board member John A. Bryant is due to take over as the company’s new president and CEO on January 2.
Bryant joined Kellogg in 1998 and has served as chief financial officer from 2002 to 2004 and from 2006 to 2009. He was appointed chief operating officer in 2008 and was also elected to the company's board of directors in July this year.
Mackay said: "I have had the distinct privilege of working for this great company over the past 20 years and serving as its CEO for the past four years. This past summer, I became eligible to retire and made a commitment to spend more time with my family. I am pleased to pass the baton to John, whose management capabilities and wealth of experience have prepared him well to drive our business agenda for 2011 and beyond."