Johnson's successor was Ulysses S. GRANT, who served as the 18th President of the United States from 1869 to 1877. His predecessor was Andrew Johnson, who had been Vice President under Abraham Lincoln and assumed the presidency after Lincoln's assassination in 1865. Richard Nixon was the 37th President of the United States, serving from 1969 to 1974. He succeeded Lyndon B. Johnson, who had been President from 1963 to 1969.