Who?

You.
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If you don't do it, no one else won't. You will notice that things doesn't come always like you expected, most of the time they only proceed when you do them yourself. If you give work to do to other people, there is a high propability that something, if not everything, won't be done. At least in time. If the thing is important to you, you have to do it yourself. That doesn't mean you have to do it alone, but being part of it is the best thing to get it done. If you just give work to other people and they are not interested in it as much as you, which very often is true, then the things won't get done.