Board member who joined in July 2007. Doug Muir is a veteran of the social.history.what-if newsgroup days of the online alternate history fandom. Though he hasn't posted much since 2013, he was regularly active on AH.com between 2007 and 2013, and has posted a large number of various interesting WIs.
Bronze Age New World - An extensive timeline he wrote already back in the soc.history.what-if days, about bronze metallurgy catching on much more widely among the New World native cultures, compared to OTL.
Since then, several continuation or spinoff projects of the timeline have appeared on AH.com. Doug has joined the discussion on some of the early ones and provided additional advice, e.g. here.