President Lyndon B. Johnson served as the 36th President of the United States from 1963 to 1969. He took office after the assassination of President John F. Kennedy and was known for his ambitious domestic agenda, which included the Great Society programs aimed at eliminating poverty and racial injustice. Johnson also escalated U.S. involvement in the Vietnam War, which became a controversial aspect of his presidency. His leadership style was characterized by a strong focus on legislative achievements, including the passage of landmark civil rights laws and Medicare, which expanded healthcare access for the elderly.