When did Tina Fey originally join SNL?!

Question: When did Tina Fey originally join SNL!?

Back when she wrote for it, when did she start!. Plus, when did she quit!?Www@Enter-QA@Com

Answers:

She was hired as a writer in 1997
became head writer in 1999
joined cast in 2000
quit in 2006Www@Enter-QA@Com

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