By Jessica Wohl
May 23 (Reuters) - Procter & Gamble Co on Thursday brought back A.G. Lafley to run the world's largest household products maker, replacing Bob McDonald immediately in the midst of a major restructuring.
Lafley is taking on the roles of chairman, president and chief executive officer, effective immediately, while McDonald is set to retire on June 30 after 33 years at P&G.
The move comes as some investors have pushed for faster improvements from the maker of Tide detergent and Gillette razors. P&G unveiled a $10 billion restructuring program in February 2012. Since then, it has cut thousands of jobs and taken other steps to speed up its operations, improve its success with new products and do a better job in both fast-growing emerging markets and in larger, developed markets such as the United States.
"Bob retired, the board called me and I felt like duty called. I'm back to help maintain the business momentum and keep this productivity program going," Lafley told Reuters.
Lafley said that, while he could not give one reason for McDonald's retirement, "I think it's a number of personal reasons."
McDonald was not made available for an interview.
Lafley, who will celebrate his 66th birthday in June, said P&G's board asked him days, not weeks, ago to come back, but he did not say exactly when he got the call.
Lafley said he is "fully engaged" in coming back and wants to finish the work that has been started on the productivity program.
"65 is the new 45," he joked.
Last summer, hedge fund Pershing Square Capital Management said it had a stake in P&G worth roughly $2 billion, or 1 percent of the company. CEO William Ackman, who has shaken up management at other companies, most recently J.C. Penney Co Inc , has blamed McDonald's team for missteps.
However, Ackman's pick for J.C. Penney, Ron Johnson, was ousted last month and replaced by his predecessor, Mike Ullman.
Lafley first joined P&G in 1977 and served as president and CEO from 2000 to 2009, when he handed the position over to McDonald.
"(P&G) wanted to bring someone back who knows the company well and can handle running it, both in the interim and to provide strategic guidance," said David Larcker, director of Stanford University's Rock Center for Corporate Governance. "Reaching out to a successful past CEO can give the markets confidence, while still allowing time for a company to evaluate its strategy."
P&G also stood by its fiscal year and fourth quarter guidance. Its fiscal year ends on June 30.
P&G's stock rose 42 cents, or 0.5 percent, in after hours trading after closing at $78.70 on the New York Stock Exchange.