Excel tutorial writer: 3 month full time contract

We are looking for somebody with expert Excel knowledge to write **original **articles explaining how to use Excel. We will need you to spend 4 hours per day for 5 days per week, for a minimum of 2 months, maybe 4 months. Please do not apply unless you have an expert knowledge of Excel, from understanding absolute references to using array formulae. **No** knowlege of VBA required.