James H. Grant, over at In Light of the Gospel , has a post exlpaining who Matt Perman is and what he has done. Much of John Piper’s labors have been undergirded by Perman administrative diligence. I especially encourage you to read Perman’s article on making online resources free of charge. You can find the post here . I would also recommend that you read Perman’s article on The Covenant of Works .