Serious: David Flynn and Mars. His evidence and theory are frighteningly compelling.

Is he widely known?

On a couple of podcasts, a fellow by the name of Tim Alberino mentioned him as having written the most important book he'd ever read, Cydonia.

I'm watching a lecture of his on YouTube right now, and unless he's been disproved, it makes for interesting viewing. He provides evidence to support his claims of connections between megalithic structures in SW England and landforms on Mars that he argues appear similar in form, only much larger. It is not the individual similarities that are most interesting though, it is that the positions of the structures themselves in comparison to one another is mirrored in an area in Cydonia on Mars. They form patterns that convincingly match one another (so far as the purported evidence isn't junk).

I encourage you to watch recordings of him speaking available on YouTube. He's very well spoken and interesting to listen to, explaining things very clearly.

The problem is, the book, it seems to me, is impossible to find, even in electronic form. Unfortunately it was published in 1996, so releasing an electronic version wasn't a thing yet.

Anyway, I'd love to hear your thoughts, and whether you have read his work.