Two of my favorite influencers on marketing are Seth Godin and John Jantsch. Seth writes pretty much daily at his site. John Jantsch writes and podcasts with great frequency. Seth tends to be somewhat philosophical. John has a strong focus on the day-to-day nitty gritty.
These two came together recently in a podcast on John’s site which gives you a sense of both men and their perspectives. I really love these guys and could listen to them endlessly. Seth has written more than ten books and John recently published his first. You can’t go wrong with these two thought leaders on your team. Give the podcast a listen.