some who wrote articles

I am looking for someone to write articles for my project. The purpose of these articles is to be informative and they should relate to a general theme. I am looking for someone who can produce 4-7 articles of a high quality. The articles should have an engaging tone, comprehensive information and include research where necessary. I expect the articles to be interesting enough to capture and maintain readers attention and be error free. I would like the successful freelancer to submit a sample article, for review purposes, prior to hire. If you think you can provide me with the quality of work I expect then please submit your proposal.