Standard language editing services
Proofreading and copyediting include correction of typographical, grammar, spelling, and punctuation errors.
Line editing includes editing for clarity and flow as well as English idioms, style, tone, and nuance.
Additional language editing services
Developmental editing addresses more structural issues. I usually make some suggestions during line editing (especially checking for consistent terminology), but also offer more extensive developmental editing for longer manuscripts. This is often helpful, for example, in reworking a dissertation as a book for a more general audience.
Region and style
I work in both US and UK English and can use any style guide.