I may not be a native writer but my TOEFL score can back my English Skills up. My TOEFL score is 107/120, the break up being:
Reading: 27/30
Writing: 29/30
Listening: 23/30
Speaking: 28/30
I also have experience in freelance writing for US, Australia, UK and Netherlands students for management and IT subjects. I have written thesis, academic essays, journal articles and also understand Harvard, APA Referencing.