Back in Season 3, I speculated that Jacob was Alvar Hanso's alias. Now that we've met both men, this speculation strikes me as less plausible. (But far from impossible -- Alvar from The Lost Experience could simply be a decoy) I'm nevertheless convinced that Jacob brought the DHARMA Initiative to the Island. In this post, I review the evidence that supports my claim.
Obviously, the clearest indication is the Man in Black's literal accusation that Jacob brings people to the Island. The former is referring specifically to the Black Rock when he says: "You brought them here." But I take the Man in Black to mean that Jacob is always the one who brings people to the Island, including DHARMA.
Earlier in their exchange, the Man in Black asks Jacob: "How did they find the Island?" More than a century later, Ms. Hawking will state that the Lamp Post "is how they found the Island." She means DHARMA, not the Black Rock, but her comment reads eerily like a reply to the Man in Black's query. How much you want to bet that the "clever fellow" who designed the Lamp Post pendulum was somehow inspired by Jacob?
Besides the aforementioned dialogue, the strongest evidence of Jacob's hand in DHARMA is probably the sonar fence around the Barracks. There's no question in my mind that the fence was specifically designed to stop Smokey. As Richard reminds Horace, it doesn't keep out the Others. And many less advanced technologies -- e.g., a simple electric fence -- would be just as effective against the Island's wildlife at a fraction of the cost. I'm guessing Jacob told DHARMA how to neutralize Smokey.
Of course, as lostmio reminds us, we never actually see Smokey during DHARMA times. I myself have wondered if the Incident released Smokey from imprisonment in the Temple or underground like Charlie cracking the wasp nest back in Season 1. If that's right, though, why does the sonar fence predate the actual threat to DHARMA? Here again, Jacob's assistance seems key. His foreknowledge of the threat led DHARMA to build the fence preemptively.
The final piece of evidence I offer for your consideration is admittedly somewhat speculative. Still, the statement in the Room 23 film that "God loves you as He loved Jacob" strikes me as more than merely a biblical reference. I suppose it's open to question whether DHARMA or the Others created the film. After witnessing Oldham's trippy interrogation methods, however, mind control movies seem right up DHARMA's alley.
And that raises one more point meriting clarification. Just because Jacob brings people to the Island doesn't mean they're good. I'm sure that the Man in Black speaks truthfully when he says many of these invitees fight, destroy, and corrupt. Some of Jacob's maneuvers are about getting the right pieces (e.g., the Jughead and the Swan) in place for lynch-pin events like the Incident and crash of Oceanic 815. The U.S. military and DHARMA were simply convenient means to these ends.
So there you have it: the case for Jacob's involvement in bringing DHARMA to the Island. What do you all everybody think? As always, you're welcome to post anonymously, but please identify yourself somehow, so I can distinguish between anonymous posters. Thanks!