Distinguished,
To prove my knowledge I can send you numerous diplomas and certificates.
But I think that you are not interested in diplomas, you want a hard worker who knows how to get job done. I am experienced in doing that type of job. For past 8 years I have been doing it very well.
I found myself well educated (master`s degree), disciplined, hard worker, experienced in writing articles, good husband, great father and above all a professional.
Bearing in mind your requirements and my capabilities, both sides can extract huge benefits from such cooperation.