Sam Harris (Gryffindor) is an expert in few things other than Harry Potter, though he apparently has a professional background in higher education consulting. He has been a Mischief Management event staff member for a couple of years, and you can most likely find him hanging around the autograph/photograph area and very occasionally on PotterCast. He has a BA in Economics and (very) recently completed an MSc in Gender, Policy and Inequalities at The London School of Economics and Political Science, where he made sure to mention Harry Potter in as many papers as he could (which was a lot of them).