Media Source, Inc., yesterday announced Ian Singer is taking over as publisher of School Library Journal, Library Journal, The Horn Book Magazine, and The Horn Book Guide. Singer joined Media Source in 2010 as v-p, content and business development. Singer takes over as publisher from Ron Shank, who is on leave for personal reasons.

Mary Wilcox has been promoted to v-p and editorial director of Houghton Mifflin Books for Children; she will continue in her capacity as editorial director of HMH Books. Wilcox joined the company in 2005, from HarperFestival. Margaret Raymo, previously editorial director for the children’s division, will assume the new position of senior executive editor, a purely editorial capacity. Of the change, Raymo says, "I'm very happy to be able to put all my energy back into creating books."

Desireé Davis has joined Abingdon Press as assistant marketing manager. Davis will manage publicity campaigns for the imprint’s nonfiction key titles. Davis previously worked as a broadcast media publicist with TV booking firm Guestbooker.com.

Brian Olshansky-Lucero is Four Colour Print Group's new Northeast territory manager. Olshansky-Lucero previously worked for the Times International Printing Group in production, customer service, and sales roles for more than 16 years.