Colin Rourke, of Warwick University. A maths professor specialising in topology.
He used to have links to two studies he did of photographs of Apollo 15 which he claimed showed they must have been faked. The links are no longer on his home page, but you can see them at archive.org, links below. Why he removed them, I can only speculate.
In the first one, he claims that by taking three photographs of Hadley Rille, from different locations, and applying a scaling factor, the skyline of each image can be shown to match exactly. (He claims this is only possible with a faked backdrop). He did this by cutting round one outline and laying it onto the other two. I did the same thing a couple of years back using high resolution versions of the images, scaled and overlaid in a graphics application (Paint.net), and found the overlap was for nothing more than a few pixels. Hardly Earth-shattering stuff when you are looking at the same flattish skyline from slightly different angles.
http://web.archive.org/web/200901160...cpr/hadley.pdf
The second one is quite easy to debunk if you examine the timeline, and the relevant photographic record.
http://liveweb.archive.org/http://ms...~cpr/spot2.pdf