When editing, I do my best to adhere to the most relevant style guide. If you’re writing according to the dictates of a larger organization (university, journal, business, charity, etc.), please let me know if they have a particular style guide they prefer, whether in-house, Chicago, AP, and so on.
Please be aware that I’m an American and, unless otherwise specified (or unless blatantly obvious from the orthographic choices in the writing), I will use American spelling and punctuation conventions.
I am a staunch advocate for the Oxford comma.
When working on longer pieces, it’s my preference to initially edit in Word, send the document to you for review, and then arrange an in-person meeting to discuss the changes (and any confusion or ambiguity in the text). With shorter pieces, the initial editing and final discussion can be combined into a single meeting.
I will also make a note of any awkward or unnatural language that obscures meaning and do my best to more clearly articulate what I believe your intended message to be. In these cases I will also comment with what I believe your meaning to be, so that we’re both on the same page about why I made the changes I did. I can offer suggestions based on your style overall, but in the end they’re only suggestions, not corrections. I don’t believe in creating dull, homogeneous voices within English.