diotima Moreover, my recent experience as Assistant Teacher showed me how robust the Montessori approach is . You've capitalized "Assistant Teacher". That makes it, in effect, a job title, a proper noun.
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diotimaMoreover, my recent experience as Assistant Teacher showed me how robust the Montessori approach is.You've capitalized "Assistant Teacher". That makes it, in effect, a job title, a proper noun. "an" doesn't go with a proper noun. Also note the word-order correction at the end of your sentence.
diotimaJust for future reference, if assistant teacher were not capitalized, would " an " be all right then?Yes, that's right.