This depends on the country/organization. See related questions.
US: Theodore (Teddy) Roosevelt to March 4, then William Howard Taft.
Theodore Roosevelt was the 26th President of the United States from 1901 September 14 to 1909 March 4. He would later break with the Republican party after the renomination of Taft, forming the Progressive (Bull Moose) Party, and unsuccessfully running for president a third time.
William Howard Taft was the 27th President of the United States from 1909 March 4 to 1913 March 4. After his re-nomination in 1912 and the break of Roosevelt from the core of the Republicans, the Republican Party was destroyed in the election, ceding the presidency to Woodrow Wilson and the Democrats.
Theodore Roosevelt was in office until March 1909 when William Taft took office.
William h. Taft
He became president in 1901 and served to 1909
1901-1909 He was President from 1901 to 1909.
James S. Sherman was the Vice President from 1909-1912 under President William Howard Taft (1909-1913)
Inauguration of President William H- Taft - 1909 was released on: USA: 6 March 1909
The 27th President of the United States was William Howard Taft from March 4, 1909 to March 4, 1913. His Vice Presidents was James S. Sherman from 1909-1912.
The 27th President of the United States was William Howard Taft from March 4, 1909 to March 4, 1913
Wm. H. Taft became President on 4 March 1909 at age 51.
James S. Sherman was the veep under Taft in 1909.
Theodor Roosevelt was president from 1901-1909
The 26th President of the United States was Theodore Roosevelt from September 14, 1901 to March 4, 1909. He did not have a Vice President from 1901-1905. Charles Fairbanks was his Vice President from 1905-1909.
1901-1909
1901-1909