I'm a big fan of Dr. Mark Cucuzzella. I've met him and worked with him in Colorado, corresponded with him through email and appreciated the work he's done for the running world. He recently was a guest for a podcast on http://trailrunnernation.com/. He speaks on minimalism, running form and injuries. I've always liked his approach toward minimalism. He's an M.D. so he can speak to the science side of running, he's a highly accomplished runner so he can speak to the performance side of running and he leads clinics for thousands of people every year so he can speak in simple, understandable language to everyone. I encourage every runner to listen to what he has to say.