In a podcast many months ago, Mann admitted that he's just as prone to procrastination as others. He may look like a super-efficient organizer, but the reason he's so obsessive about productivity tools is that his perfectionism gets in the the way of, well, getting things done.
Mann is a natural podcaster. His output is a bit sporadic (see above, re. procrastination), but when he posts something, it's always engaging and worth listening to.