Average Formula For A Specific Condition

I have been asked at work to get some averages of data from an excel sheet. I have attached a sample workbook of the data i will be using. On Sheet1 is the data that will be looked at and on sheet2 is a sample of the results i need to achieve. I can get the data on sheet2 easy if i knew that data was static but in my case the data is going to be dynamic, so i don't know how many records each person is going to have each time if that person shows up in the record set at all. This rules out on static ranges to gather averages.

So far what i came up with is i use a macro to copy all the "Names" column to sheet 2 and then filter that data so that each name is unique, sort like a "key" for looking up values. Now i need to get averages of "Total Hours" worked in sheet 1 and display it in sheet 2 for each "Name". I have a formula worked out and almost have it where i want it but cant seem to get the range of data i need to be looking at. I need to get the Average Of hours Worked Per Person Where "Wk End Date" is greater than 1/1/2008 and the "name" matches up with the name in sheet 2.