もっと早くゲスト先生として迎えたかったのですが、なかなか長い時間がかかってしまってごめんなさい。

Translating to: = I wanted to have you as guest teachers earlier but I am
sorry that it took a longer time than I had expected.

What exactly is the function, I have learned the volitional + とする means to
attempt....but this is a noun
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2019-02-21T09:43:14.147
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grammar
Question on として in this sentence
This として is not "the volitional + とする" but means "as" such as "He came to my
school as an English teacher(彼は、私の学校に英語教師として来た。".
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2019-02-21T16:35:00.607
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To elaborate more on Yuuichi Tam's answer, it's "as", in the definition "in
the role of" or "in the context of". For example, to use Yuuichi Tam's
example:

彼は、私の学校に英語教師として来た。 = "He came to my school as an English teacher" = "He came
to my school in the role of an English teacher".
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2019-02-21T21:02:59.463
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