Donald H. Rumsfeld, the powerful defense secretary and architect of the Iraq war who left office two years ago as he faced ever-rising criticism, is working on a memoir to be published by Penguin Group (USA) in 2010.

"This will be a story that will span my lifetime," Rumsfeld, 75, told The Associated Press in a telephone interview Monday from his office in Washington, D.C. "It will be something that I will try hard to have be very fair and honest and useful. I hope it adds to people's information about these times."