Peter Nicholson, former chief creative officer at Publicis/N.Y., and Jeremy Postaer, formerly a group CD at GSD&M, have joined JWT/N.Y. as executive creative directors. The pair -- who will partner on the Diageo, Rolex and Cadbury Adams accounts -- are the first major creative hires at the agency since former Wieden + Kennedy/N.Y. co-ECD Ty Montague took the reins at JWT in November. ... Stop-motion animator Peter Sluszka -- who collaborated with Michel Gondry on the Grammy-nominated Steriogram video "Walkie Talkie Man" -- has signed with New York's Hornet for commercials representation. ... Director Eden Diebel, formerly of HKM, has signed with Great Guns/USA in L.A. for commercials representation.