Exposure

Which of the following is correct:
1.I have 23-year long exposure to industry, teaching and research.
1.I have 23-year long exposure in industry, teaching and research.

"Exposure to" usually means to me that you've been in an environment where you were able to observe a certain field or gain some passing familiarity with it, but it doesn't necessarily mean that you actually have in-depth experience in that field.

As a result, the sentence sounds odd to me. To have 23 years of only passing familiarity with a field seems like a strange claim to make.

To try to stick to the original sentence as much as possible, though, I would choose 1) and re-phrase it in this way:

"I have 23 years of exposure to industry, teaching and research."

Both of your sentences seem a bit odd to me. I agree with JamesM in his sentence structure.