I am an American (living in Mexico) and have had quite a lot of writing experience. Please check out my reviews on my Profile page. One employer said that I was "amazing" and exceeded expectations.
I was unsure of how to approach this proposal as there isn't enough detail for me to make a definitive bid, either for the price nor for how I would approach the job.
I don't know who you would want me to interview nor where he/she lives, but please know that I have Skype and can call all over the world. I also do not know how long an article you want, nor do I know for what purpose you want this article. Is it for a newspaper, a magazine, a newsletter or a website? And, is this for one article or a series of interviews?
The length and the purpose of this article will impact on the price, as will also if research is necessary. If it is necessary, the price will also depend on how available is the information on the interviewee. Is this information that can be readily found on the internet or will it require a bit of exploration?
I am very interested to know more about this project and I hope you will contact me so that we can discuss this further.