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George Lucas is the original writer for star wars, he has changed it for good or for bad (most who saw the original say for bad) and wrote the prequels when filming the original.
Ewan McGregor and Dennis Lawson are related
The credited screenwriters were George Lucas, Lawrence Kasdan & J. J. Abrams
Ewan McGregor
When Samuel L. Jackson was in negotiation with George Lucas to do the Star Wars prequels, he asked for a purple light saber. No other significance.
Star Wars, even the less-loved prequels, is wildly popular both in terms of box office receipts and in terms of long-term cultural impact.
Episodes I, II, and III are prequels to Episode IV, which is often called "Star Wars." However, a prequel to Episode one set in the youth of Yoda is also rumored.
'Star Wars Episode VII' .
Star wars 4, 5, and 6 were directed by George Lucas. All the star wars films were written and screen played by him also. Star Trek was made by J.J Abrams.
It's unknown, but in the Prequels he had to be about 60, which makes him in his late 70s or early 80s in the Original Triology.
As far as filming order is concerned, Star Wars: A New Hope (Episode IV) was the first Star Wars. The prequels (Episodes I-III) were filmed much later, and they served as the backstory that leads to the events of A New Hope.
JJ Abrams, director of 2009's Star Trek, is to direct Star Wars Episode VII, however, before this point, no.