Over time we made a number of changes to his blog with some success but one thing I suggested was to move his byline (his name) from the bottom of each post (where it was very small and buried among other details) to the top, just under the post title where it was more prominent.
The result was almost immediate and the blogger concerned reported to me a week later that he started getting much more personal feedback from readers in the form of comments and emails. His overall comment levels jumped by around 50% and they often included his name. It seemed that previously no one really knew who wrote his blog and that just by highlighting his name readers became more sticky and willing to participate.
I wouldn’t guarantee a 50% increase in comments on every blog that did this – but I suspect that it might help.