JWT president Michael Maedel is relocating from London to Singapore to be closer to emerging Asian economies. Toby Hoare, executive chairman of JWT UK, will assume additional responsibility, beginning January 1, 2007. ... Bartle Bogle Hegarty/New York head of design Declan Stone left the agency after a year and a half to rejoin his twin brother Garech at The Stone Twins in Amsterdam. The Stones, 35, founded the company in 1999. ... Los Angeles' Zoic Studios added Barbara Genicoff, formerly a freelance editorial producer, as VFX producer for commercials. ... Rob Mueller, formerly of David Wagner & Associates and Chris Karabus formed Chicago-based firm The House of Representatives. ... Philadelphia's Concrete Pictures added David Sparrgrove, formerly of V12, as creative director. ... Lewis Communications named Stephen Curry creative director at its Birmingham, Alabama office.