Hi. Although I live in Brazil now, I´m an American editor and proofreader, a native English speaker with years of experience correcting and improving technical writing of various types. I use Track Changes to show you all my corrections of English grammar, spelling, vocabulary, punctuation and sentence structure, and always offer suggestions for improving the organization and clarity of your ideas, should that be necessary, without interfering in your own personal writing style. I´d be happy to do a revision of your work, so please contact me for further discussion. Thanks, David