This depends on the country or organization. See related questions or re-ask your question.
US: Franklin Delano Roosevelt
Franklin D. Roosevelt was the 32nd President of the United States serving from
to 1945 April 12 when he died of a brain tumor. He was the longest serving President of the United States and led the US through World War II which started in 1939, but in which the US would stay neutral for 2 more years. Roosevelt was born January 30, 1882 in Hyde Park, New York and died April 12, 1945 in Warm Springs, Georgia.
Chat with our AI personalities
Franklin Delano Roosevelt was President of the United States from March 4, 1933 until April 12, 1945
I am not sure what you mean by "a model," but Franklin Delano Roosevelt was the US president in 1939 and he was still widely admired and trusted by the vast majority of Americans.
The Executive Office of the President was established in 1939 to give the president the necessary support needed to govern the country. This was established during the second term of President Franklin D. Roosevelt.
Franklin Roosevelt appears on a closed circuit TV broadcast in 1939.
Congress
Gerald Ford
The first president to appear on television was Franklin Delano Roosevelt. He spoke on April 30th, 1939 at the opening ceremonies of the World's Fair, but Harry Truman was the first president to give an address from the White House, occurring in 1947.