The U.S. President who wrote the book series titled, "The Winning of the West" was President Theodore Roosevelt. It is a four volume set, Volume 1 - from the Alleghenies to the Mississippi 1769-1776; Volume 2 - from the Alleghenies to the Mississippi 1777-1783; Volume 3 -- The Founding of the Trans-Allegheny Commonwealths 1784-1790; Volume 4 - Louisiana and the Northwest 1791-1807.

Theodore Roosevelt, Jr. (October 27, 1858 – January 6, 1919), also known as T.R., and to the public (but never to friends and intimates) as Teddy, was the 26th President of the United States. He was a leader of the Republican Party and of the Progressive Party.

During his life, he was also a Governor of the state of New York and a professional historian, naturalist, explorer, hunter, author, and soldier. He is very well known for his big personality: his energy, his vast range of interests and achievements, his model of masculinity, and his "cowboy" image. Originating from a story from one of Roosevelt's hunting expeditions, 'teddy bears' are named after him.

He lived for 60 years and died in 1919 after a blood clot had detached from a vein and traveled to his lungs. He was at home in Oyster Bay, New York, USA. His final resting place is Youngs Memorial Cemetery, Oyster Bay, New York. Today, historians credit Roosevelt for changing the nation's political system by permanently placing the presidency at center stage and making character as important as the issues to the country.

More Info: en.wikipedia.org