There are a few others, one of our moderators (@J.E.S) is a YEC. There have been a few “drive by” YECs that have kind of blasted a bunch a posts and then took off in the time I’ve been here. I realize being a minority viewpoint, especially in a topic people feel very passionate about, can be quite difficult. I do wish we had more YEC folks as long-term conversation partners but there is such a large philosophical gap between YEC and atheists, in particular, that it makes dialog very hard and emotionally taxing.
Right now I think the Peaceful Science website itself is run by @swamidass, but a non-profit organization is being formed currently to grow the effort (particularly in areas of Ancestry, Art, and AI). A lot of the financial/grant-related stuff is being done through Washington University in St. Louis, I believe. There was some funding from the John Templeton Foundation for helping @swamidass workshop his GAE book, for instance.