I've recently come across Neil Patel from NeilPatel.com. I have listened to him on about half a dozen podcasts as well as read quite a few articles from his blog. I found his interviews especially on how to start and grow a blog from nothing to a healthy audience extremely useful and interesting.
If you are a marketer, sales person, or someone who is looking to grow their product or blog he is an invaluable resource. I am still just scratching the surface of the content he has to offer, but I recommend that you check it out over at NeilPatel.com.