A presidential system is a system of government where an executive branch is led by a president who serves as both head of state and head of government. In such a system, this branch exists separately from the legislature, to which it is not responsible and which it cannot, in normal circumstances, dismiss.

The title president has been carried over from a time when such person actually presided over (sat in front of) the government body, as with the US President of the Continental Congress, before the executive function was split into a separate branch of government. After this split, the President was no longer needed to sit in front of the legislative body, although the executive title remained in legacy.

Although not exclusive to republics, and applied in the case of semi-constitutional monarchies where a monarch exercises power (both as head of state and chief of the executive branch of government) alongside a legislature, the term is often associated with republican systems in the Americas. Presidential systems are numerous and diverse, but the following are generally true of most such governments:

Robert Irby Clarke (June 1, 1920 – June 11, 2005) was an American actor best known for his cult classic science fiction films of the 1950s.

Robert Clarke grew up as a movie-loving kid in his native Oklahoma City, Oklahoma. He decided at an early age that he wanted to be an actor, but nevertheless suffered from stage fright in his first school productions. He attended Kemper Military School and College, planning to make a career in the service, but dropped out after his asthma prevented his serving in World War II. He later attended the University of Oklahoma, where he acted in radio plays, and the University of Wisconsin–Madison, where he appeared on stage. He did not graduate, but hitched a ride to California to try to break into the motion picture business.

After screen tests at 20th Century-Fox and Columbia Pictures, Clarke landed a berth as a contract player at RKO. His first credited role was The Falcon in Hollywood in 1944, then went on to play small roles in The Body Snatcher (1945), Bedlam (1945), and Dick Tracy Meets Gruesome (1947). When RKO dropped his option three years later, he began freelancing. In the 1950s, he appeared in many classic science fiction films, including The Man from Planet X (1951), Captain John Smith and Pocahontas as John Rolfe, The Incredible Petrified World (1957), The Astounding She-Monster (1957), From the Earth to the Moon (1958), and The Hideous Sun Demon (1959), which Clarke wrote, directed and produced.

Shashi Tharoor (Malayalam: ശശി തരൂര്‍) (born 9 March 1956) is an Indian politician and a Member of Parliament (MP) from the Thiruvananthapuram constituency in Kerala. He previously served as the United Nations Under-Secretary General for Communications and Public Information^{[citation needed]} and as the Minister of State for the Ministry of External Affairs.

He is also an author and columnist.

Shashi Tharoor was born in London to Lily and Chandran Tharoor, both Malayalis, hailing from the state of Kerala^{[citation needed]}. Tharoor studied at Montfort School in Yercaud and Campion School in Mumbai^{[citation needed]}. He attended high school at St. Xavier’s Collegiate School in Kolkata and obtained his Bachelor of Arts degree in history from St. Stephen’s College, Delhi.

He went on to win a scholarship to study at The Fletcher School of Law and Diplomacy at Tufts University and earned three degrees in three years - a Ph.D. and two master's degrees at the age of 22, Tharoor is the youngest person in the history of the Fletcher School to be awarded a doctorate. His doctoral thesis, "Reasons of State", was a required reading in courses on Indian foreign-policy making. In 2000, Tharoor was awarded an honorary Doctor of Letters degree^{[citation needed]} by the University of Puget Sound and in 2008 he received an honorary doctorate degree by the University of Bucharest^{[citation needed]}.