Patrick Mulligan has resigned from Gotham Books, to work full-time for Pop Chart Lab, a design startup he cofounded in 2010. He can be reached at patrick@popchartlab.com. Mark Short joins Houghton Mifflin Harcourt as svp and head of international markets. He was at Pearson. The Bookseller has updated their piece on United Agents’ acquisition of AP Watt: 12 of 16 AP Watt staffers are joining UA as part of the merger. In the UK, Christian publisher Lion Hudson will publish crime and women’s fiction aimed at a broader audience through a new imprint, Lion Fiction, set to launch in spring 2013. […]