Hello, mauroitu.
I am a former PhD Student in English and am well aware of the rigours of academia and the requirement of your dissertation to be absolutely without grammatical or formatting flaw. I am a very detail-orientated editor who currently works as the Managing Editor of a writing company, with over a decade of writing and editing experience. My "keen eye for detail," as noted by my 5-star Freelancer review last week (which has yet to be uploaded to this page, for whatever reason, but should be able to be viewed if you click on my "portfolio"), will be applied to your document to review sentence structure, grammar, tense, flow, and I can certainly keep my eye open for passive sentences, as requested. I work quickly, effectively, and thoroughly. Feel free to send me a sample page of your disseration if you would like to test out my editing style. Thank you for your time and consideration, Alexandra