grammar concern

PWe are printing an award for a teacher and it's not immediately obvious where the mistake is.  He has provided guidance and service from August 2006 to August 2008, but we are printing the award before his term ends.  Is it present perfect progressive (has/have been)?

1. He has provided guidance in physics since his arrival in August 2006.

2. He has provided guidance in physics since he arrived in August 2006.

3. He has provided guidance in physics since he arrived in August 2006.

4. He provided guidance in physics from August 2006 to August 2008.

5. By the time he leaves in August 2008, he will have provided guidance in physics since arriving/his arrival? in August 2006.

A recommendation?

Thanks

-A

Hello,

I am the one who posed the original question (not anonymous now).  Mr. Micawber, you chose "He provided service from August 2006 to August 2008".  Is this necessarily wrong, "He has provided service since August 2006" ?  We are printing the award in July, so, it is not a little awkward to use past tense for a line printed in the present about a term ending in the future?  I am browsing through the documentation of this site, http://leo.stcloudstate.edu/grammar/tenses.html#present%20perfect.

-A