BECOMING A TEACHER - what kind of certification is needed

Hi everyone,

I am moving in to the US next year and I am already preparing myself for it. I'm a French as foreign language teacher and I'm wondering what kind of certifications I need to be employed in a public or private school.
I would be pleased to read your advice and experience if you're a teacher or stand in the same situation!

Looking forward to reading your answers :)

In which state?

http://wdcrobcolp01.ed.gov/Programs/ERO … ory_cd=SEA