I'm a native English speaker with experience in proofreading master's and PH.D. level theses and dissertations.
My bid is for a 100 page document, double-spaced, at the rate of $20/hour. I can ensure your dissertation will have absolute correct grammar, spelling, and punctuation. I will repair all wording issues, and leave comments for any issues for which more information is needed.
I will use Track Changes in Word with a starting and ending comment so you will have clear record of the time I spent.