The Nottingham fighter, who defends his title against American Jermain Taylor in Connecticut this weekend, has for the past seven years kept a diary on every aspect of his professional career.
Keen diarist Ken Owen from Llanfechell has kept a diary for 53 years.
Those taking part ranged from a man who has kept a diary for 53 years to a 22-year-old who took it up in 2012.
Malala Yousafzai was just 11 when she was writing her diary, two years after the Taliban took over the Swat Valley, and ordered girls' schools to close.
"To some people the 24- to 36-hour ordeal of smoking a 20-pound pork shoulder seems a little crazy, " says Erik Leander, a home chef who buys whole hogs from an organic farmer and has kept a smoking diary for five years.
"I've been writing down my thoughts in a diary for the last 10 years and I keep going back to the US Open and there was nothing there, " said Campbell.
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Anne Frank's diary, written during the two years the teenager and her family hid from the Nazis in occupied Amsterdam, made her a symbol of the suffering of Jews during World War II.
The instant popularity of the diary of Anne Frank in the postwar years suggests an intuitive grasp, on the part of its readers, of what made their war different from previous wars.
But his diary, which he had maintained for several years, was saved on one of his laptops, and Gibson, Dunn found it on his hard drive.
But these jottings have a second purpose: They're diary entries of sorts, bringing into sharp focus travel memories that might otherwise fade under the weight of years.
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Whilst research in more recent years has begun to move away from focusing on the successes or failures of a small number of generals, the diary has remained central to an understanding of not just the role played by Haig, but of the British Army, her generals and her allies.
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